My daughter uses this for drawing on her ipad. It helps stop accidental drawing. She is left handed and it works well for her, but could also be used by a right handed person. I didn't even know such a thing existed until I found this one - great idea and works well!
So I have two ipads, however the other one has a paper-like contact cover on it. That cover is good and alleviates the problem of resting the drawing hand and has a great papery feel, however it comes with some small drawbacks. Especially when it comes to nib degradation over time.
The glove however, means I don't have to semi-permanently modify the ipad with a tricky to stick cover and it retains that glossyness, brightness and sharpness. It also means that I don't get my side palm streaking over the screen. It's smooth now but not slippery.
Build quality wise I'm not really sure I could say at this point. I'm careful when I put it on and take it off. It's actually a single fabric piece sewn together at the base of the ring finger so that's the only weak point I could see being an issue. It's got elasticity in it too for when you've got long fingers. I'd say my hands are about average and the glove isn't too lose. Fingers also work on screen through glove.
Overall an insanely good purchase for the price if you're a glossy screen tablet artist. I feel weird not using it.