This has been a sin from my side not to review this great extemsion as have been using it already for a long time and almost on every joomla site created by me.
From my experience - It works on all the templates, without any crashes, outstands all the site traffic components and modules and even more - it is free...
Thank You for making JoomlaWatch
p.s. and when you want to impress the clients ;) go for this one - always works for me :)
p.p.s. and it definately works on 1.5 Joomla!!! (somebody had this concern) - haven't had a single problem