@Sirspuddington – As I’ve only used the DFGT, I can’t really say whether any other wheel would be better or worse, neither do I know how it will play on future F1 games, as it did play very well on 2010 and 2011. I’ll add that contrary to popular belief the pedals are actually good, and I haven’t had any problems with anything bar the handling on F1 2012. It works very well on GT5, as it was designed for that game, so you would kind of expect that. I guess it depends on how many games you’ll play it on and how much you want to spend.
Personally, if you’re just wanting to spend £100, and only wanting to play F1 then I would advise you to wait at least until F1 2013 to see if it’s any better, because it frustrates me beyond belief on 2012. However, a lot of people still use theirs, so perhaps it’s merely a matter of preference. I, myself cannot stand not having steering lock.