Spent the day putting Keyshot 6 though it's paces for one of my larger studio clients yesterday and must say they've really nailed it with this version.
I took a basic model from FormZ into Keyshot (using the new high quality OBJ export options) set up new bespoke materials for all the surfaces, applied a fave HDRI studio lighting rig and had a final render in less than 15 minutes from import.
This for me is the beauty of Keyshot. There may be more powerful or more physically accurate rendering packages on the market but none with such a quick and easy workflow.
I always shied away from recommending Keyshot to my clients because I thought it was too expensive and the rendering equivalent of keeping stabilizer wheels on your adult bicycle. But they've really nailed the power/ease of use ratio over the last couple of revisions and in a world of 'time is money' I can't think of another renderer that enables you to achieve such professional results so easily, quickly and with a minimum of specialist rendering skills.
I still don't see it as a solution that competes with V-Ray, Thea etc for architectural rendering but for product design, set design, exhibition design etc, it's a fantastic weapon to to add to the rendering armoury.