Changed my mind and installed it anyway, Christ, you only live once...
Seems ok. I use ZA Free firewall, and the old CCleaner couldn't remove the ZA log files except after a restart for some reason, and so I always had a certain number of bytes 'to be removed', but the 'bytes removed' would be '0' after a couple of runs, which told me that the only things not removed were the ZA logs.
With version 2.0 however, I can never get to '0 bytes removed'. No matter how many times I run the cleaner, it shows '201 bytes removed' (made up of 134 bytes from 'IE Temporary Internet Files', and 67 bytes from 'Doc & Settings\.......\History.IE5\desktop.ini'.
Whether this is a fault with the Beta, or something that the earlier versions should have been doing, I have no idea, although I'm sure people on here with more computer knowledge than myself will know!