The iPoker network

He has awesome results. 15% ROI at $50 level is ridiculously good. I do think a bit of it is down to the network he plays on though. (please don't be banning me for saying this!) The iPoker network is particularly soft for sit and go competition, especially at that sort of level. If he were to play on Stars, I think he would find it much more difficult to sustain that level of ROI - the players on there are just a huge step up from iPoker in terms of average skill level.

Btw - Spacegravy finished his prop bet - he cleared $25k in 22 days just playing $60 turbos on stars. He played just under 6000 games in 22 days, with an ROI of 7%, and played a little under 300,000 hands

Double Bonus ...

You sure have the right idea. But watch out for hybrids. There are a few 9/6 machines that "clip" you on 2 pair by returning only even money. This costs you a lot.

Many players prefer the Double Bonus versions though they do not pay back quite as well as a true 9/6. The "bonus" machines offer a chance for a better short-term pay on aces thru fours. This may be more fun for a short-term player. Long-term or frequent players will do better on a true 9/6, but with fewer thrills.