I read that one of the reasons for the update was that vBulletin wasn’t mobile-friendly and it many ways it wasn’t. I don’t find this version to be that easy to use on mobile either. Posting is easier but reading is worse and navigating is a little of both.
I do like that if I log out on my phone it logs me out if I’m logged in on a PC too. I don’t use a shared computer but if I did this would be good.