First I wanted to say that I am extremely happy with the products that have been released over the past few years from VBSEO. Juan and Company have always been professional and support is top notch. I did some testing and eventually upgraded my site to vb4.0 and vbseo 3.5. I had some issues, all of the my fault, with vbseo 3.5 and support was almost instantaneous here, which I give an A++++.
Now for VB 4.0, I give the new software a D -. Trying to understand the documentation, or lack there of, gives you a headache even before you start. The duplicate content issues are horrible, even if Google states that there is not an issue and you can use the canonical tag to help Google find the relevant content, VB has refused to even address the issue. There are many bugs being reported on VB.com. It is my belief that they released their product way to early and it seems they did this for some financial goal for this current calendar year. The commenting on the Blog and the CMS are also horrible and if you promote an article to the CMS and try and merge the comments or posts, even more of a mess.
Now I am not trying to give anyone any ideas on their possible purchases, but for current users, I would certainly stay with VB 3.8 series and the new vbseo 3.5
Sorry for the ranting, just my two cents!!