I voted single cause that's what I got. Reason, cause I am a cheap bastid and didn't have the money to get more. I did go for the memory foam mod though...$90. Today was the first day and dang! I love it, soft, cushy and really does re-position you on the bike.....awesome!
I'm a large guy (6'2", 330 lbs), and I got the double foam just after he started offering it. I've never sat on one with the single foam, but the double made a huge difference! It moved me back and down to where I have a much better position. I have back problems, but now I can ride comfortably for hours. I'm planning on getting the 4" risers, but the BadX seat mod is the best money I've spent.
I'm 6'2 250 and I got the extreme mod single foam. I love it. I wanted to go as low and as far back I as I could. I haven't had any real long distance rides since I had it done but I have put over 250 miles in a day on it and no complaints. Hope this helps.
i got the single layer and hated it i felt like i was sitting on the pan, i hurt to ride after just about 10 to 20 min
i sent i back got the double foam and it is great
i am 5' 11" and 275 so if you are a bigger guy double is the way to go
Looks like it will be double for me too. Now, I just have to find a seat to use in the mean time. I just got out bid on ebay for the only one there. At least (it seems) to have gone to a real rider and not a "shop" who will just jack up the price and resell it. :roll: