I've tried it and so far so good. It feels different and takes getting used to, such as the sensitivity of the controls, different weapons, different looking characters. I feel like I'm playing an xBox game. The maps have the same layouts but have different decorations.
It works pretty well with my 2.4 ghz Intel Core i3. It's a cheap laptop that I bought for $600 about a year ago, so if it works well on this PC, then you should be humming along on your Alienware desktops.
I would suggest we try it for the LAN tourney next week so we can iron out any kinks, and be ready to go full-bore with CS:GO in November (and CSS will be old by then).