I've used it for about 3 months now. It's the first iPad keyboard that I've every actually stuck with. The keys are a little loud, but they have the best tactile feel of any keyboard I've used in this size. The best thing though is that it is just snap on and forget.
It's about the same size as other 9.7" iPad keyboards so it is a little small, but the adjustment period isn't bad. I jump between my Apple bluetooth keyboard for Mac and my ASK for iPad seamlessly. It takes some practice but I use it for hours at the time to write and take notes rapidly. My typo rate is probably a little higher than on my Mac, but I'd say my speed is about 90% of what I get on my Mac, but that's also because I use a wrist rest when working on my Mac sometimes.