Not to highjack your thread driphone, but I'm in almost the same situation as you!
iBookG4user's comment really strikes a chord with me:
I picked up a demo MBA RevA from BestBuy here in Canada for $1350 Cdn (about $1150 US) and bargained a 3 year service plan with BestBuy (eh, not the greatest I know, but probably better than AppleCare anyways for what I need - I'm an exchange and repair kind of person).
I was hesitant to pick it up with it being a demo model and all, but I'd been eyeing it for a while and nobody else was biting. I had also read about the overheating issue, the loud fan, the shut downs, etc. and so was a bit reluctant to take a chance. I have an iMac for the heavy lifting so to speak, but I do take my portable computers on business trips, meetings, etc., so it can't be
too much of a lightweight.
I've had it for just over a week now, and yes, when I've been on Skype or iChat for over 45 minutes, or if the laptop has been on for more than 3 to 4 hours, the fan kicks in and it does seem rather loud, although not quite as loud as an Acer Aspire Netbook that I tried and returned. It does slow down and occasionally grinds to a slow walk if I have more than 3 to 4 programs open (Aperture, Lotus Notes, FireFox, and transferring large photo files) *but* I'm trying to tax the MBA as much as I could use it in a reasonably "maxed out" situation to see if it does shut down or if I can tolerate the so-called deficiencies. In addition, it was a demo model for about 1-1/2 months, so while it would not have been running under a full load, it would have been up and running continuously for a significant time.
For a RevA model, I have to say it's a "tight" machine, the keyboard is nice (better than the first gen chiclet iMac keyboards), and the screen is wonderful - probably better than the new glossy 13" MBs as many claim. It really is nice to hold! It has yet to shut down on me so far, and while it does get warm-hot on the kitchen table, it doesn't seem *that* bad. Mind you, I'm not the kind of person who uses laptops on a bed or soft surfaces frequently.
For me, the price jump up to the RevB HD version is $500 Cdn minimum (educational price) plus another $200 to $300 for AppleCare or equivalent warranty. I admit that I'm the type of person who does look over the shoulder and "wonder" about the brightest and best, and tries to invest in quality (too many lessons learned from buying cheap stuff).
So, I'm trying to decide if I should
return this demo RevA and
just get a RevB... but the $700 difference can buy a lot! It would be a $1200 difference if I went with the RevB SSD model!... and this is where iBookG4user's comments hit home. And rumours of a Mac tablet / biggie iTouch are just too tempting... I admit the extra 40 GB of HD space between RevA and RevB models is enticing.
If I didn't know about a RevB, I'd just keep this RevA. And interestingly, the fan was on when I first jumped onto MacRumors because of a recently ended iChat and Skype sessions ... and now it's quieted down to almost nothing and motoring along just fine...
Well, I don't know if this helps your decision, but if anybody else more experienced wants to comment, I'd appreciate hearing the feedback! Thanks!