My DeathAdder is good, but be careful what surface you get with it. I wore away the teflon pads under the mouse with quite a rough aluminum pad. Currently I have DeathAdder with a Razer Destructor surface, it's AMAZING. I bought some new pads from Play, made by another company for £4.99.
Reliability? Can't even remember when I bought it now, it's been that long. 1+ years.