I've smoked a few packs of Spice Gold when better things haven't been around.
I would say that a decent sized amount does produce an effect. Although, it's not long lasting and seems to have a strange quality to it. The ten fags in half an hour is a good feeling of it. I'd be kind and say that at it's best it's like having a joint with barely any cannabis in it, and that cannabis being of a poor quality to start with. Addiction was never even on the horizon - it just tastes okay (honey and vanilla) and fills those moments. It certainly doesn't come close to even moderately good cannabis and it's blown away by a pure roll of the premium.
I got really paranoid about the JHW carcinogen thing, but haven't smoked a ton of it and realize I've (unfortunately) been smoking cigarettes quite a bit recently, so all things in context.
BZP became one of my loves for a while. Particularly if mixed with TPMFF. Considering it was an underTC but none the less legally available product, the effect was close to E. It was nearly on the same level as E in terms of intensity (I'd take 9 pills sometimes but the intense rushes and waves of sensations that flow with E can't quite be matched by BZP, TPMFF - it's more like an intense, prolonged zoning out into calm focus). The TPMFF did add a certain emotional depth that BZP alone lacked. The pills produced the same ability to talk and open up, but they seemed to lack the 'you won't believe it without trying it' power of E in terms of emotional attachment - you're talking with or at people rather than connecting on a base level. It's difficult to describe, you do feel it, but it's not as meaningful - more like just the revelation of things. Neither do you have any visual trippyness - which might be good for those people who go a bit strange with E. Duration was on a par with E, although when you finally woke up the next day much of it had washed away - whereas I find you still seem to have some warmth after sleeping with E. Pupil dilation approached rediculous, like E. Entire loss of appetite, similar body load (next to none once it was working). In some senses, I can imagine the BZP TPMFF combo is better than E for some people since it's easier to control - you chat lots and change emotionally, but you don't go into that special zone of funny faces and absolutely crazy behavior even on large amounts (maybe a bit, but not as severly - you do get strong jaw ache). Personally, I enjoy the feeling of wanting to mush yourself against someone until you melt together that the legal version lacks.
I judged it's similarity to E partly based on whether or not I thought someone who hadn't taken E could tell it was something else, which I'm sure they couldn't. With my understanding of the general public's knowledge of drugs, I have to admit that's a bit unfair. But when I first took it, I had no idea what to expect, thinking they'd probably be some herbal product that'd just made me feel sick. If you look at the ingredients for some of the OTC pills, they're mainly stuff that I know for sure will do little other than make customers feel sick - like woodrose seeds - or do nothing at all - like Amanita Muscaria, in capsule size amounts (I've eaten a mini mountain of Muscaria and felt nothing whatsoever, Pantharina is entirely different). But as the effects came on I did start wondering if maybe the headshop guy had done me a special favour. Only comparing the details with good quality E do you start noticing the differences. If you get some dirty pills (solvents, something other than E or E mixed with other junk), the BZP TPMFF mix might actually be the better choice - particularly in terms of nausea and any serious risks from things like PMA.
I also tried some pills he had that were supposed to be similar to speed. He didn't have any ingredients listed on them, but I did feel a moderate but prolonged rush of energy compared to BZP, TPMFF alone (again like E, not producing that kind of prolonged burst of energy).
The guy I bought them from at a local headshop kept them in the back and didn't advertize it. I think the powers that be have decided to take action not because of people like him, but the guys making it into a counter top, colorful product that seems perfectly harmless to the average shopper. Despite being a big fan, I'm no where near stupid enough to suggest any drug is something someone not experienced should pick up and take a lot of in place of buying a few beers, particularly when it takes the amount of time this does to really start up.
It's also interesting, as with all drug prohibitions, to look at how they're going about banning it. In the US, the DEA have a report claiming that it is ten times more harmful than meth. This is actually an error, which should read (as those of you with some worldy experience might guess) ten times less. They've acknowledge this, but the report hasn't been corrected to my knowledge. I believe their own advisory judge also didn't think it worthy of scheduling, but they ignored that. The US has banned it and New Zealand (I think, or Australia) followed on the basis that the US had. I think it's also being regulated as a Class A around Europe this year (09).
Remarkable when you consider that a Class A or Schedule 1 can result in life imprisonment. I would be interested to hear what reasoning that level of punishment is based on, given that you'd have to actually kill yourself taking it for imprisonment to equate to helping save yourself.
In some ways, I see it from the pragmatic eyes of the DEA guys, looking out for kids who'll be taken advantage of by RC companies making things seem safe without genuine testing. I used to work for a similar company and I know the kind of tactics the legal vendors will use. Flat out scheduling is a cost effective means of protection.
Through my fairer eyes, there are other methods they could use to protect kids and the cost needs to be paid to keep it fair (and safer, so not everything is evil and tempting). Add to that a pinch of realistic evidence that something genuinely will mess them up and it helps.