Theres so much stuff out there for the PS2 not made by Sony and at a much lower prices. I'm tempted to buy some of these products specifically another controller and memory card but i am wary of the quality of these products. What do you guys think ? I have a few questions :

Whats are the differences between the Sony PS1 controller and Sony PS2 controller ?

If i buy a PS1-PS2 converter (upgrades standard Sony PS1 controller for PS2 use) would it be as good (or full-featured)as the official Sony Dual Shock 2 controller for PS2 ?

Can anyone recommend any decent third party controllers (ideally as good as the Sony Dual Shock 2 controller) and memory cards ?