It works very well, I use one, a few things you should know about it first though:
1. When you update your AKAIO, make sure to backup your save files on all your games. (they sometimes get reset)
2. Not every game works with every update, some get fixed, and others break.
3. When playing games, always make sure you have the Anti Piracy on while playing, because some games don't have the anti piracy, until near the end... and thats just mean.
4. Some games won't work if you have cheats on, so you have to turn them off for some games.
AND FINALLY!
5. Not every game works online, so you should check ahead to make sure you don't have to on/off and you didn't save. (always a problem for me.)
That about covers it... I hope.