I loved my RAT, and so did my son, until they died, which for both was roughly 15 months after purchase. I loved the feel and function, right up until it went wonky and stopped tracking. I have been using my Logitech G602 every since then with zero issue.
Please stop voting for the RAT 9, I have one and it's a POS, I've had nothing but problems, also it has trouble with tracking on black surfaces and surfaces with different colors. DO NOT BUY A RAT MOUSE, THEY ARE TERRIBLE!
I have a RAT 9 and I love the thing! super smooth. love that I can change the size and weight. not sure what you both had issues with but I love the mouse however it did take some getting used to.