I haven't had the core shutdown issue, but I am also seriously considering a return of my MBA. I emailed Amazon and they said there would not be a restocking fee. I'm concerned that won't be the case after I ship it back, but I do have the email to fall back on.
I'm on the fence about going back to a 15" MacBook Pro. My original laptop was a 1.67 Powerbook. Like many, I love the size and form factor of the MBA. I started seeing one too many rainbow beach balls, which has me concerned. This also had me thinking that I could benefit from the extra real estate of the 15". I took a quick trip to Best Buy last night and just played around the MBP. Programs launch fast and the screen size was nice. It was as expected much heavier than the MBA. I can get over the ports, since once it's set up, I really don't need the extra ports of an MBP.
With any laptop, there are trade-offs. I'm just not sure I can deal with the tradeoffs of the MBA. I do love the thing though, just not sure it's for me.
Can anyone offer insight as to the differences between the glossy MBP and the MBA screen? I love the brightness of the MBA and the keyboard is excellent.
I think part of the problem is that I run an 8-core Mac Pro with 10GB of RAM as my main machine. I might be a bit jaded.
Anyone go from MBP to MBA or vice versa?
BTW, good luck to the OP. Looks like you are on the path to resolving your issue.