Okay, thank you very much for the reply!i had a rival 600, they are good mice but I would think there is a better choice now. I never used its weights, it was heavy enough. They make good hardware, it tends to last forever. My last two mice were both Steelseries.
Depends what you want in a mouse really. most of the other Steelseries mice are ultra lights.
such as this which seems to be recommended over the 650 now:
I eventually got a Logitech G502X only as I hadn't had a logitech mouse in years.