But as it stands, it's horrible. It's laggy, lacks pressure sensitivity, and the apps are clunky at best.
Here's to hoping there's a push from Apple to improve things. But for the time being Microsoft's Surface line is about a thousand times better for actual creatives.
With Wifi it's actually laggy, but with the USB cable, it has been very fast. Pressure sensitivity isn't that important to me - depends on your use-case.
Tried it with Photoshop and Illustrator and it works great. Being able to see what you draw is great, far better then a normal Wacom Tablet.
So far, it's a great option. A bit on the expensive side, but cheaper then having to buy a Cintiq or a Surface :)
If you can, try using your wifi on the 5ghz band. In some cases that helps a lot