I'm a
long time SimHQ reader but rarely post (lost my old account) so my opinion may not count for much... but I've got to say I'm really enjoying this beta.
I have a very vivid memory of seeing the original CC in a gaming shop in town and sprinting the mile and a bit home to excitedly tell my mum how I'd found the most awesome looking game... you can fly planes, drive tanks, steer ships and everything! (pretty much my exact words all those years ago). With money in hand I then sprinted to town again, and back home. Man was it worth it!!!
The beta has pretty much evoked the same feelings (just without the need for so much running... thank you ADSL!) - I love the idea of launching fighters, it's an odd thing that you don't see much in games / sims these days but gives me a real "launch the alert 5!" kind of buzz. The voices are great, the engine is gorgeous, the controls work really nicely (although flying mantas is odd - feels a bit more like space sim controls - no yaw, just roll and slip). The concept of the game still feels fresh to me, but I'm sure I used to be a bit better at it!! I'm yet to take over an enemy island

Aside from missing a campaign (greyed out menu option) you get what feels like the original main game from CC. I've only found one bug so far (post processing == mouse lag), generally it feels like one of the more polished betas I've seen. Also (this may not interest some) xbox 360 pads work a treat.
At the moment this really does feel like a true-to-the-original remake, very impressed.