Have been playing on the live server they have right now for about a month. Decent population for a 1x server. Very friendly community. Active player base at all hours of the day and night. And surprisingly the lower level dungeon finder is extremely active and popular for that fact. Every one is always rolling alts, Bo gear is available for cheap cheap vote points.
NO DONOR GEAR! NO PAY TO WIN!!!
And the new progressive server is going to be so bad ass. Currently i know of 2 alliance guilds and 2 horde guilds that will be competing, all 3 of which are 25 man hardcore guilds, with several several smaller 10 man hardcore guilds.
WE NEED ALL ATM!! Alliance side is a little bit lower population than horde but only by maybe 20-30 people max? Would be nice to see some more active healers though in the 70+ brackets.
I just joined last night, my first time on a private server and so far I'm impressed. I haven't come across any bugs with the game client yet, although registering for the forums seems a little off right now since characters haven't synced from the Algalon realm that I'm playing on, but the game itself is awesome. It's like I'm actually back in Wrath, just with a smaller population.