I have to agree with the sentiment here. yes the website has been around for awhile but here are a few things that are somewhat troubling
1) No source code. Without this it is impossible to determine what the application is collecting and doing. This is an issue with all closed source material, but for an application that claims to be essentially one hair width away from being a keylogger, such disclosure would be a nice step
2) Dubious value. Again what are we trying to measure here? I guess if you're some kind of Korean Starcraft player your APM/mouse movements might be worth measuring? Other than that, I guess it's 'interesting' but not much beyond that.
I guess for me #1 is the most critical. For something that 'tracks' keystrokes then uploads encrypted data to a centralised server for stats tracking, a bit more clarity in how the application works would be nice and really aleviate a lot of the legitimate security concerns.