Originally Posted by STRAFESTRAFE
TF2 is a much slower game than Quake, and scout requires the most tracking aim. Low sens benefits tracking more than anything, so it's only natural to use it. Lots of top scouts use very low sensitivities too (dante was at like 38"/360 or something). Also, the vast majority of scout 1v1s don't play out like that - you're mostly strafing in front of each other. It's less tricky to turn when they jump over you than it sounds.
If someone's behind you in CS, you're probably already dead. If you just hear a footstep, you almost always have enough time to turn.
It really depends on the situation. Sometimes someone will fire at you when they are at a really disadvantaged position (when you are standing behind something and not end up killing you, so you can still react and fire back.
In any case, is my only option the G400?
The Deathadder 3.5G is known for having an incredibly high malfunction speed.
The Roccat Savu and the RAT 3 optical have the same sensor as the G400 and the Deathadder, so they might be a decent mice.
The CM storm spawn also has the same sensor as the above mice, but I've heard of a few problems at low sensitivities.
You could also look at mice with the Phillips twin eye sensor. I've heard of reliability problems with the RAT series mice with that sensor. That sensor also has some problems with certain cloth mouse pads.