I'm going through the exact same evaluation. I've been using NVR3 for 6 months, but it does not scrub footage easily, and the Android app for it is very limited and kludgy.
I just loaded Milestone. Maybe they're having a bad day, but several links on their getting started page are down, including their FAQ link. (Never a good sign from a tech company.) Also, can't get the Android app to work with my server, but it also doesn't work with their Demo Server. Hmmm.