The Kova[+] is one of the more comfortable mice I've used in awhile. I've always been a big fan of my Razer DeathAdder just because of its size and the way it sits in my little hand. I used to love the old MX-510 from Logitech until I realized there are mice out there that don't require my hand to sit off my desk to use them. I found the Kova[+] to fit just right in my hand. The forward and back buttons were easy to access for melee and internet browsing. The only thing that really seemed to be an issue as far as comfort goes would have to be the extra set of side buttons for the left handed user. My hand doesn't really find use for these as they are a bit awkward to handle and are easily bumped for unnecessary clicks. Personally at this point I feel there should be a left hand and right hand version developed separately. Good economic design, poor user feel.