I have to say, the DFP sucks at the moment, I mean it works great... but after a little bit of use, the thing starts having problems, all I hear about these things is "It broke", which is true, my brother spent $150 on this thing, we used it, a few months later, the wheel no longer locks, the gears are messed up, and of course, Logitech claims "It's not covered under the warentee".
Before you say anything. We DID NOT abuse the wheel, and we only used it with GT4. We kept it locked on a table and it never moved, we didn't take it apart until WAY after it broke. So there no reason why it should have stopped working.