>> You'd have to use the standalone version for 2 years and 4 months before it became more cost effective.

You'd have to use it continuously for that time. If you use Photoshop less frequently, ownership makes even less sense. For example, I use Photoshop maybe every few months. It would take me a lot of years of $30/mo to get to $578. And I'd be happier with Adobe when I got there, because I'd be on a current version of the software.

I hope they don't mess this up with crappy DRM, like in their standalone CS editions.