My first impressions:
The site definately looks better.
Works slower, probably because of JSP
Site navigation needs to be improved (Bulk register button is not reachable from main menus, I didn't yet find domain push link, etc, etc, etc.)
A few bugs I'll report to moniker directly, not to waste space in DNFORUM.
New domains registration is a HORROR. Looks like godaddy now. Registered a couple of new domains and my first impression was - Oh, may I switch to old site? Where is 1-click reg which was promoted in pre-upgrade announcement? I understand that registrars wish to follow godaddy as godaddy is so successfull with upsells of hosting and blah-blah-blah... But it works for/with end-users with a couple of domains only, not "Professional" domainers!