It doesn't take long getting used to; I was accustomed to the MBP within the hour. Gaming performance is really good. As stiff as the spring appears to the touch, you can't feel it at all during play or surfing/office work. Jerky movements are easily handled. Owners of game-oriented mice with a thick and heavy wire (*ahem* Razor Boomslang) will appreciate this toy. On a more personal side, using the MBP also eliminated another problem I was having. The desk I use for my main system has a slid-out keyboard tray which I push back when I'm done. Thanks to inertia, when the tray locks in place my mouse keeps going and ends up somewhere out of reach. I then proceed to bang my head against some corners to get it back. With this little device I no longer have the need for [as much] Tylenol.