Check out this thread here:
http://dynamic2.gamespy.com/~nbalive/ph ... hp?t=10530
I mention my problems with the Logitech Dual Action Gamepad towards the bottom of the page.
There are two versions--a slicker, shinier version which is dark blue, and a "frosted" version with glittering speckles.
The latter's left-analog stick is SUPPOSEDLY fixed as opposed to the former's horrible callibration--which lay in the right-analog stick. Forgive me if I've just confused you.
All in all--it's a good pad, but beware the lingering problems that I, and many other consumers have encountered (their opinions can be found on the Logitech User Discussion Forums on the official website).
As for the Wingman Rumblepad, I've read nothing but good reviews. I have one myself. I bought the Dual Action b/c the analog sticks look sturdier--but the WR is good nonetheless. Not sure if there is any supported force feedback, however.
Go for the Wingman Rumblepad.