Overall, I'm very pleased with this beta series. So far I have yet to find any trouble, however it should be noted this is running inside my home with more or less casual traffic.
The interface feels much snappier. I don't get the long login loading times that I used to, even with 7.3. (My browser is the latest Apple Safari). Things have been rearranged and functions clarified, so that's a big plus, too. Additionally, the new features and enhancements (at least the ones I can use in my home infrastructure) seem to work quite well.
I dare say it at least feels production-ready *to me*, certainly more so than other beta series in the past.
My one request, which I mention in passing because we have a workaround, is remote verification for PPTP and L2PT (or is it SSH?) vpn users ... right now we have to have users verified against the firewall's local password database. For any other action we get the opportunity to verify against a remote database. Personally, I use Apple's Open Directory that comes with Mac OS X Server, and it seems to work quite well with Astaro, aside from this minor/known issue.