Hello there, I must confess I love heavy mice, I got so spoiled by the MX1000 that I don't want to use any other mice. BUT unfortunately it's gotten discontinued already. As kind as Logitech was, they sent me a Performance MX as free replacement, yet unfortunately the height of the mouse is pretty uncomfortable as compared to the MX1000. Also the weight... the Performance MX has like 50% less weight - it feels like I'm moving a box of matches on my desk. To try it out I also ordered the magic Mouse but I doubt it will be any better in case of weight. I do feel enticed by the many amazing gestures you are getting with the MM, tho and I so hope it will be enough for me to keep it. Anyone here who used the MX1000 and can't find a good heavy and ergonomic substitute? Any input is highly appreciated, guys!