What sets metrics apart?

I think the main difference is metrics is aimed at people who want to make revenue from blogging. That is two differences right there - it is not a general webmaster tool, it's aimed at bloggers so tracks the stuff bloggers are interested in (though obviously still works for non-blogs) and the advertising revenue metric side has already begun with adsense tracking.

Because it is aimed at bloggers you will see each blogging software has its own script and templates. Other tracking solutions tend to have one script that goes into every page. Initially most platforms do not track every page view, just the posts and comments. As Nick says though, the code is all there to improve and tweak how you like it. If you put the script into every page it would track it, you might want to set the Z_ title and category variables to something that would make sense to you though. It's definitely an area we would like feedback and help on.

The second difference is our focus on community interaction, we want to make this the very best it can be by listening to what you all tell us you need and make that happen. This isn't a "here it is, like it or lump it" operation as you will have already learned in the short time we have been around! We really do want you to tell us what you like and contribute if you can. Already we have great contributions on the WP side and the products only been in beta mere hours, great stuff!

I could go on and on, but I don't want to get boring, heh. Why don't you tell us what differences you have found?