1. After editing several pages I see my browser has 20 tabs open ? Why?
2. The text editing window is WAY too small .... Version 3 was much better. It cannot be enlarged! Useless
3. When we click on Components / PB Pro we see a window saying 'Get Started' ... Why? Clicking on this link opens yet more new tabs?
4. Opening a page opens yet more tabs ....
5. My client (thankfully only one on Sppb 4) finds it very difficult to edit / use. I understand I may get used to it but I'll use it daily ... my clients will not!

and thats just for starters.