I got my DFGT a few months ago, only just had chance to use it properly since I got a WSP from some birthday money. I haven't used any other wheels before, so I don't have a comparison base with a G25 or anything else.
I have noticed what might be that mild gear slipping, but I don't find it distracting & love the wheel to bits (much more fun than a dualshock). No problems so far...fingers crossed.