Hmmmmmm I'd say it's definitely heavily depend on your preference.
I like small mice so this is actually a good mouse for me, the other mouse I use is Roccat Kone Pure. But you have to consider your hand size and grip style.
This is meant for more fingertip or claw style. If you palm your mouse then this might not be for you.
Also if you come from DeathAdder (which is a larger palm mouse) then you might find Logitech G303 too small.