The stylus that comes with the Surface Pro 3 is Bluetooth. I keep forgetting about it because it doesn't have a hidey-hole in the tablet to store it.

I haven't tried the handwriting interface with it. Let's see. Okay that's not too bad. Bit slower than I'd expect but the ink is responsive. My Newton Messagepad was never that good at my terrible handwriting! But it was that fast at reading the pen. You do need that part to be fast; laggy inking is a bad experience.

The stylus on the Newton was extremely responsive partly because all the smarts were in the screen. I seem to recall the Surface could have a second touch layer that responds only to the stylus. Android tablets that expect to support stylii might have to do that. I could be wrong.

Wade.