Wireless controller, much more comfortable than using a wired controller(in my experience anyway), & no cables to trip over.
This controller uses 2.4GHz RF(Radio Frequency) which means you don't need line-of-sight to the PS2.

Other functions exactly the same as PS2 controller(DualShock2):
Pressure-sensitive buttons, including four trigger buttons
Dual-Shock thumb sticks
Analog button = switches analog mode on/off.
Start & Select buttons

LEDs on controller & receiver flash until they've linked(only takes a second or 2, when you first turn controller on)
Range = at least 6 metres when I tested, if there's objects between controller & receiver this can reduce the range though.

There is a slight glitter finish on the controller, it's pretty subtle though - only really visible in bright light.

Analog LED only lights briefly when you press the button, it doesn't stay lit when in analog mode. Personally I prefer it this way.

Requires 3xAAA batteries, not included. I'd recommend rechargeable batteries, batteries should last quite a long time before needing recharging though.
Controller has an on-off switch to stop batteries draining when not in use.

XBOX & PC (when used with adaptors) :
Works fine with XBox->Playstation, & PC(USB)->Playstation convertors I'm selling(as at Feb 2010).