I am using vB4.0.1 now along with vBSEO 3.5 RC2 with the 2.6 beta1 sitemap gen. I upgraded from 3.8.4 in December. I am not using the cms yet although it is installed (I shut it off). The forum and blog is running perfect but there is a bug that needs to be fixed in the cms. When you add a table to an article, it drops down about 30 lines or so on the page and leaves an unacceptable white space. Once they sort that issue, I will most likely migrate to the cms. For now I code the website and just use the forum.
I am quite pleased with 4.0 so far though. I feel that by mid spring it should be rolling along very well. They are working like madmen (and ladies) on developing and making it better.
Thank you very much. That is what I wanted to know.
It's the CMS part of it that I'm most excited about, so based on what you said and what I've read elsewhere... I will wait a bit and let them sort that bug out.