I haven't tried any of the handwriting apps but am intrigued. Now that I have a better understanding about the pens I'll definitely be picking up some backups.
iFebby, the case is pretty nice actually. It comes in 2 pieces, the inside is a rubber glove and the second piece is a plastic shell that has holes cut out where nubs from the rubber piece protrude. The corners are extra thick, has built on volume and power buttons. The fit is snug and has all the cutouts for sensors, usb, jack, etc.
I was a little underwhelmed at first but after it was on it looks sharp and I really like the different textures, feels good and isn't clunky. Its definitely better protected and I feel a lot safer with it, fits real nice.