Who me? I'm not really a hater. But I have run across a few that were out of spec, specifically in the bolt lug dimensions, causing extraction problems or causing a complete lock up of the action. A lot of guys use them without a single issue. Cool.
The reason that I really don't recommend them is that they don't really do anything better than a standard bcg and they're generally more expensive. The "wipe clean" thing isn't really any different. My BCGs all wipe clean, with the exception of the bolt tail. Carbon collects on the bolt tail on a NiB bolt just like a phosphate bolt. So, if you can wipe a phosphate carrier and bolt clean just like NiB and you still have to deal with carbon on the bolt tail, what does NiB really get you for that extra cost? Plus, you do have to lube them, despite the early claims about NiB. Seems like same/same to me. Just shiny and more expensive.