I love a good Apple brand accessory--say what you will about the price, at least you know they're going to fit perfectly and be fairly durable. (Over the years, I've found that the Smart Keyboard and Smart Covers are built like tanks and can withstand just about anything.)
However, I can't do a sleeve of any kind in this case. Mentally, I just can't get past not having some kind of cover attached to the back of the iPad. I used to love the Apple silicon cover for the back paired with the ASK, but it seems they're not going to make those any more. So if I were to get the sleeve, I'd have the keyboard on top, nothing on the back, but the sleeve covering the whole thing. Problem is, I don't like always having my iPad put away. Sometimes I like having it out and ready to use if needed. I will not do that with nothing to protect the back. I have two kids in the house, and if you leave something vulnerable, they will, by nature, find it and destroy it.
I could use a sleeve with a skin on the back and smart keyboard on the front, but that doesn't protect the camera bump at all. So Apple will not get my money this time around for the leather sleeve. I just pre-ordered a Poetic soft TPU case with built in Pencil holder to go along with my ASK, and the whole setup will fit inside my Swiss Gear iPad bag. Peace of mind as far as protection, and MUCH cheaper overall.