I do not like it, Sam-I-am.
Mostly I go to Goole groups only when reading the "This week in Perl " summaries, but I liked the old interface a lot better.
My two main complaints are that it has way too much space for ads down the right-hand column, and it doesn't visually separate the notes as well as the old one did. And the "show quoted text" trick often gets confused.
Definitely a step backward IMHO.