I haven't seen the 6 or 6+ version yet. I had both the iPhone 4, and iPhone 5 versions, and was satisfied with both products. It's a great case if you use the included belt clip, not so great if you keep your phone in your pocket. The belt clip broke twice on my iPhone 5 case, and both times was replaced free, under warranty. The silicone/rubber skin tore on the iPhone 4 case, and was also replaced under warranty.
I found the integrated screen protector to be adequate. The only real problem I had with it was that the screen was recessed so deeply in the case, that I had trouble hitting the edges of the screen sometimes.