Well, I went ahead and did it, first on my test site which is on my local server, this upgrade went swimmingly, yes, as stated in the instructions, I had to reinstall the tab plug ins for some extensions I had but that is no big deal really.
So I went ahead and did the upgrade on my live site, upgrade went ok but, I lost all of my groups from group jive, they have gone completely. And joom gallery disappeared, it seems that the upgrade uninstalled it, at least I couldnt find it anywhere and so had to reinstall it.
But it is up and running now, I will give it a full test later to see if there are any errors anywhere.
Regards Holly.