I'm, so far, pleasantly surprised with the new interface. For me it has been fairly quick, with most things working....one that doesn't are the links Kerry mentions.
One of the more important things (to me) I had inquired about long ago has been addressed and works well...that being able to post code without it being mangled into something completely unusable.
It still is a far cry from the nntp groups I'm used to, but I don't think it will keep me from using it....which is exactly what the old interface did for me.