Not much discussion here lately, so I'll stir the pot.
I've been getting quite a bit of stick time on Circuit Studio lately.
Haven't generated Gerber outputs yet, but will soon.
I've loaded/imported many of my previous designs and libraries from the current and previous versions of Altium Designer, and from as far as back as Protel 99SE. Everything, schematics, libraries and PCB's, loaded without mishap and with no errors.
I have not used the Vault nor Circuit Studio or Altium "canned" libraries (never have, always generated and maintained my own) so I can't speak to that.
I've completed a couple schematic designs and can report that I am still pleased with my purchase decision to buy Circuit Studio. It has 90% of everything I use in Altium Designer everyday at work.
The underlying dialogs are pure Altium Designer, although the Circuit Studio ribbon menu SUCKS! If they had left the menus intact and just grayed out or deleted the features they didn't want us to have, instead of the wholesale change they made with the ribbon, Circuit Studio would be mopping up the competition. I can get used to it though.
I believe subsequent revisions will make it an even better bargain.
For the money, the new price in particular, you can't go wrong.
No affiliation, just a happy customer.