Haven't played Diablo, but for Quake II/III, Half-Life, and Unreal, they have worked out well for me (I must confess I am not a hard-core gamer but I don't like getting fragged). The great DVD support and TV-out was the main reson I bought them, though.
Got the Fury Pro for $80 after rebate from Best Buy a few months ago, got the Fury for somewhat less ($60? I can't remember exactly, but it was a steal at the time) from a local shop maybe 16 months ago.