Game cheating thingamajiggers

Okay, weird question of the day: Has anyone ever owned or used the Action Replay Max or the Gameshark for the PS2? I've got some little cousins who are a product of today's society (as in they don't like to lose and they don't know how to take losing well), and I'm thinking of picking up one for them. It'd be nice if they could just sit and play a video game (or any game, for that matter) without bursting into fits because they died or something. Guh, I have no idea what these kids are gonna do once they hit the real world, but I'll worry about that later.

So, anyone know about these things? I e-mailed the Action Replay folks and they said their disc might not work on older PS2s, and I hear Gameshark is having issues. Any advice would be great, thanks!

Seriously, who breaks into tears about an Uno game? UNO!!