Yikes!
You guys, the Creative Cloud is NOT cloud based! Adobe used the name because it is the hot, new, sexy word. That's it. Really. I swear!
It is a download only software distribution system. You download and install in pretty much the same way as you always did. If you think that the Internet (and Adobe along with it) is going to do down at the very moment your hard drive fails - the drive you forgot to back up, then I suggest you back up your drives rather than worry about the confluence of events that could actually cause you a problem.
If you want, it will tell you it wants to upgrade your software, and you can tell it no if you are in the middle of a project. Or you can say yes, now is a good time.
The decision should be strictly financial with some wish fulfillment thrown in. If you upgrade every time a new suite comes out, or you buy cameras that require upgrades to your software between releases, then it might make sense. Get out a calculator. Admittedly the numbers work better if you normally get the Master Collection.
So, here is a question for you. Are there Adobe programs you only need once in a while but can't justify buying them? Well, that's over for me. No more wishing. For a mere $50 per month (less the first year) I can have it all. I have finally started using Dreamweaver, and I want to give Muse a try. Lightroom might come in handy every couple of months. So might Acrobat. Or Fireworks.
But sticking to the numbers, how much is your upgrade? Divide by $50 even though it is less for a year. Obviously it is better to upgrade instead of subscribing to the Creative Cloud. Unless you need other programs. Unless you need constant upgrades because you stay on the bleeding edge of technology. Unless you could save money moving your web site hosting over to Adobe (bring your own Domain).
Basically, I like the Creative Cloud idea. For me. For now. You? Well, that's up to you, your wallet, your habits and your needs (and wishes).
Steven
http://www.stevengotz.com