Yeah I've got the HiShop anti-glare back on my phone at the moment. Overall it's pretty good value for the money. The cut is very precise and goes almost right up to the edge. The matte finish is nice and smooth, though not great at keeping fingerprints off. I've had some bubbling issues in the corner with the camera lens, but that may just be because I take cases on and off all the time.
I also have the SGP Ultra Fine EX but haven't tried them out yet. I'd say if you're just looking for a standard anti-glare back, the HiShop is probably the better deal.