Hmm... well, do you have any suggestions for mice of similar or better build quality and weight? Palm grip is also preferable as claw grip makes me hand tired and crampy.
I took a look at the Mionix Naos 3200, which is about the same price, has a great shape, and good weight, but it reportedly shares microswitches with Razor's Deathadder which is known for flimsy buttons. That's a big con. Someone else suggested a Logitech G400 to me, but several reviews I've read seem to indicate that it's much more cheaply built and lighter than the MX518 it replaces.