tried x once about 4-5 years ago and i didn't think much of em. we were in a bar and a friend pulls a couple out and asked if i wanted to try it. he gave me 2 and i waited...a little speedy, nice feeling and warmth but not worth near the 20 bucks each they normally cost. i mean for 40 bucks i could have had a lot better time doing other things, i think...especially in vegas!

but trial and error...that's how most of us do it.

good luck with your trial...