Basically, the DualShock is a good controller. If anything it's probably a little 'blocky'. They should smooth all corners a little to make it more comfortable, and add a little weight while you're at it. The DS1 had good weight.
As a side-note, I don't have a DS3. I still have the launch model PS3 (with the biggest HD, 60/80 what is it?), so I only have two SixAxes. Anyone want to tell me what the difference is between the SixAxis and the DS3?







