Quality:
This case isn't all it's cracked up to be. I have a 50-pound keyboard (Kurzweil PC88MX) that's been mildly damaged twice from the bumps it received through normal gigging inside the case. It's very heavy, but doesn't protect that well--the center handle once pulled off halfway when the case/keyboard was picked up, and just by pulling one of the end handles to roll the keyboard/case along, the metal bent and curved. I wouldn't trust this on a plane, ATA-certification or not.

Desirability:
I thought it was going to be the perfect case, because I wanted something highly protective and SKB's guitar cases are wonderful.

Support:
I needed to get the case repaired (see above), and SKB's customer service was friendly and helpful, hassle-free.

Quality:
I have a Kurzweil PC-88MX, and the case simply can't handle the weight of the keyboard. It bends, the handles pull off, it's not pretty. And they expect this thing to survive a flight? I barely trust it on the road. If you don't abuse your cases much (i.e. don't travel) you probably won't have an issue, but even for semi-regular gigging it doesn't hold up.

Value:
I'm looking into getting a different case because it's not sturdy enough, but like I said, SKB stands behind its product. For the price, it may be better to go with Calzone Cases, which is what I'm looking into--they'll build a custom case for about the same as this one, but if weight is an issue the SKB case wins (the case I'm looking into is 10-20 lbs heavier).

Support:
Customer service is fantastic--they fixed up my case for free (I just had to pay shipping there) and called to make sure it got back to me in good shape.

Overall:
SKB's guitar cases are much stronger. Don't buy the keyboard case unless weight is your primary concern.

Feature:
Just plain tough. The wheels WILL go over any surface you can. It's protected my keyboard for about 6 years.

Quality:
Every other case is compared to SKB. Have you ever watched your keyboard slide down an stairway? Imagine the tears.. Or the smile you get when you remember you paid a few extra bucks and got SKB

Support:
I broke a latch. I was broke. I called. The guy at support said my case had a life time warranty. Sent me the latch in good time. Fixed the latch. Played the gig. Efficient and courteous.

Overall:
I am pleased. I expect to have the case along time.

Quality:
I own a yamaha P90 and I tried fitting it in the case at a store. SKB says that that the yamaha P90 is supposed to fit. Well it definetly didn't fit. It did fit in the case(length-wise, and width-wise), until I tried closing the case. The case was not deep enough for the keyboard.

Value:
At double the price than most cases, this is a horrible value.

Support:
I haven't dealt with their support, obviously since I do not own any of their equipment. However, I have heard from many people that they have lousy customer support.

Overall:
If you need a good case I would recommend a Gator Tour Style case.