Revised to great:

I have now upgraded to Premium and it is well worth the money!

This is a must have plugin! I am amazed at the number of login attempts I see and the ease with which I can manage bad behavior!

The free version is really great but the paid version is down right amazing!

My initial review was titled:
Good but I can not say great … yet

I can not give it the final star because my first experience showed it misses some stuff.

It caught 3 out of 38 injections on the first run on an infected site.
That said – the ability to see dif on changed files is awesome!
I love the IP logging and the ability to permanently block bad guys.
Easy to set up and run!
Price seems really reasonable.

I am on the very of getting a 10 site license but am a wee bit leary as response to support requests in the forums seems pretty backed up at the moment.