Well, I seem to have migrated OK. Eventually. Though the whole process felt like I was stumbling through in the dark. I agree with those saying there needs to be a much clearer indication which of the options are the correct one for those of us with existing forum and store accounts and which password/username (store or forum) is required. Right now it's the opposite of intuitive.
One caveat though. The store page with products, download links and serial is now a long list of pull-downs which have to be individually clicked on to expand. The layout once expanded is an improvement on the old jumbled one, but could we have the whole lot on a page without the need to keep clicking to see the serials please?
It's really useful to be able to take a print if the whole lot, save as an mht file, convert to pdf etc. so a local copy is handy during installation, or as a permanent record. The new layout requires an awful lot of clicking...