I had to pick up a cheap mouse the other day so I went to Best Buy. I also know my mx510 has an intermittent short in the cord, so I looked at some of the other mice to get a feel, so to speak, of what is out there. I was absolutely amazed at how much more comfortable the Razer copperhead felt than the mx models (I have big hands though).About as amazed as I was by the mx after using a :vomit; intellimouse for a year. I'm not endorsing Razr, as it seems like QC is spotty and software/driver support may border on nonexistant and I certainly wouldn't suggest you purchase from BB, but you may want to check it out, just for comparison.