StatCounter. I figured that it would be about the same as Google Analytics. But I haven't been watching the stats on Google Analytics for a long time now, as the interface there has gotten so wildly complex. If you understand the information on Google Analytics, well, you scare me a little bit.
It's good to keep an eye on stats. I have to admit that I had been "flying blind" for quite some time. Now I have bookmarked StatCounter, and am obsessively checking it. I've only just started seeing what it can do, but I like it.
Yeah, it's free, and the page is riddled with ads, and there is the usual "upgrade now" messages. But that's to be expected. Even with all that noise, I can still understand it better than Google Analytics.