Although it is in beta status, it seems to me quite stable.
But I'm talking from a general perspective, I mean I didn't test with nasty websites or files.
I am glad that the "experimental 64 bit" option is gone. No more restarts when it is enabled for the first time.

I have as OS Windows 7 64-bit and I'm NOT going to change to windows 8, unless I really have to.
But still I like the new approach you have taken with the new major version.
Thanks for such a great piece of software !
Currently running comodo dragon inside it with drop rights enabled and I see no errors and the browser is responsive as always.
I don't have a LUA or SUA account, I'm always logged in as admin

But I have other security programs running as well, firewall, hips and AV, behavorial blockers.
Nothing is as comforting as a sandbox, makes me feel more safe than using only other security products.
Anyway, thanks and cheers !
(edit: not to brag or kiss *** or anything, but I did buy the lifetime license for sandboxie)