When left button on my first Performance MX's started random double-clicks (seems to be a fairly common issue after a few years) I replaced it with another, as it was £49 rather than the £70+ that the Master MX was at the time, and there wasn't anywhere near enough in the Master to make it worth £20 more. I was chuffed enough with my first one that I bought another for work.
The Performance is a cracking mouse. I tend to keep mine connected to the charging cable unless I'm playing an FPS or something, and the battery doesn't seem any worse than it was when I got it (I'm sure it is, but it clearly doesn't deteriorate quickly).
It's good for games in the same way that a membrane keyboard is. A mechanical keyboard is a little better (see a wired dedicated gaming mouse) but a membrane keyboard (see a high end wireless mouse) is perfectly capable.