I installed it on my blog as soon as I discovered it.
Better performance than WordPress
A themes/plugin directory may help
The community can decide where ClassicPress is going via a petition system. This is open source the way it should be. A stable and secure CMS with no surprises. I'm currently running about 20 sites on ClassicPress with no issues.
Friendly and supportive community. Continues the great tradition of WordPress without all the recent upheavals.
Needs more themes and plugin developers to get on board, but this is starting to happen.
ClassicPress is the base code I learned from and worked with for 10 years and I'm glad to see it continue on without drastic (destructive) changes.
Best thing since "sliced blocks" :)
None so far!