I seriously can't decide between the Logitech G500 or Razer DeathAdder gaming mice, they're both equally good but I'm not sure which to get. The logitech has better quality and cool features, but Razer looks better and uses a better sensor because it's infrared, however it is known to have a reputation of bad quality...
Have you tried both of them to see which one you like holding more? I have the G500, my roommate has the DeathAdder; I personally like the feel of the G500 (probably used to the mouse design) more and you get more buttons if you like, that's not to say I dislike the DeathAdder I just prefer the G500.
Well lasers "will" skip if they are put directly on glass or possibly an opaque surface. Highly reflective surfaces probably aren't good either.
However laser mice can be used on many more surfaces than the old ball mice. Those you practically needed a mouse pad in pristine condition or else the rolling mechanism would get all gunked up. I have yet found it necessary to "clean" a laser mouse, minus the natural oils that are left by my hand and turn into layers after a long time.