This iMac design has existed since October 2009 and has had restrictions (or obstacles at least) in place from day 1. Same with the mid-2010 refresh. While I love the design, I miss my SSD's and being able to make upgrades to MY machine. Not only will I not spend the ridiculous amounts of money that Apple wants for their SUB-par SSD's, but I want to be the one who makes the choice as to what SSD(s) go(es) into my machine.
As I noted, not all SSD's are created equal and Apple has been using Toshiba ones both in the iMac and the MacBook Air, although they recently switched to significantly faster Samsung SSD's, at least on the Air.
I'm about to buy another 27-incher of these next-gen iMac's and after going through THREE (3) bad iMac's (2 of them had bad screens and in one, the audio out jack didn't work right). Needless to say, I've come to know the various hard drives they use in all of them. First of all, it doesn't matter if you're getting a 21.5" or 27". You'll get either a Seagate or a WDC for a 1TB and a Hitachi if you choose a 2TB. The one you want is the Western Digital, the Caviar Black to be exact. By contrast, the Seagate (Barracuda ST31000...AS(Q) drives are LOUD, whereas the WDC 1TB's are virtually completely SILENT and run incredibly well. The difference is not only noticeable but very significant. As soon as I have a buyer for my current iMac, I'm heading straight to the store. I already warned them when I was there to swap out my iPad 2 for a THIRD one. My bad for ordering online instead of going into a store.
Having said all of this, my iMac that I bought last July is on 24/7, literally, and it's seeing a LOT of use and it performs superbly. I love it. So did my iPad 1 and so does my iPad 2, but sometimes, it looks like there is some pain involved at the time of obtaining the actual product.


I got them good for every time they made me come back for another iMac but this time, I think I will just open it up, take the damn thing out of the box inside the store, have them plug it in and take out my microscope so as to actively try to find something. ANYTHING. And if I find so much as one bad pixel on the very end of the screen, they will go back and get the next out. Once the screen passes MY standard for perfection, I'll try every other component that I CAN inside the store, ther most important of which will be the hard drive. I won't jump through these hoops again where I find out after unpacking my iMac, setting it up, configuring it only to find something wrong with it in the process, such as an imperfection in the screen or a loud hard drive. They're going to bring out one after another until I see the letters WDC in System Profiler on a crystal clear, immaculate and flawless 27" screen, and when I get the thing home I had better be able to hear a pin drop after running it through some stress tests for an hour. I don't care if I sound unreasonable, because guess what, it is POSSIBLE! The one I have now is that perfect, so why would I accept anything less than what I already have??? I urge all of you not to "take it" and "deal with it", because we're paying a bunch of money and most of us (I dare say) are REPEAT customers, aren't we??!??

I'm already getting anxious and angry about this and my purchase is still a few weeks away. WTF!??? Getting back to these new restrictions, why does Apple think this is necessary to do? Do they really think they'll sell more iMac's if they put up more and more barriers for the few end users like us who care to make any modifications at all???