I have 7 sets of these 50' cables running through my house along with HDMI and Optical. So far I have had no problems with ghosting or artifacts, 720p and 1080i look great! (I don't know about 1080p since I don't a 1080p source or display.
I almost feel bad writing this review as up until these cables I have had nothing but amazing success with MonoPrice cables. That being said, these cables are terrible. They are super stiff and slide right off of any connector you put them on. I've tried them on 3 separate TVs, 2 receivers, and 2 DVD players, all of which they simply slid off by the weight of the cable. I installed these over two friends houses and they called me complaining that their TV didn't work, come to find out the cables had simply slipped off. I hope the premium cables are better, I'll be trying them out shortly, the only temporary fix I could come up with was to pinch the connectors with pliers.