So I bought a set of metolius curve nuts a couple years ago when I came across a deal and I never used them. I racked them up last weekend just to do something different and I loved them. I have always used BD stoppers before. I found these were much easier to place and clean compared to the BD stoppers.
I have too as well. In the beginning I wasn't sure if I was going to like a curved nut or WHY I REALLY needed them - but after using them found them more versatile or irregularities in the rock where the curved nut shined!
Been using 'em for years. I think they're great. Light, strong, compact, good size range, seat better in flares, don't get as welded as ordinary curved nuts. For routes that need more than a single set, add the five DMM offsets (or substitute offsets for some of the Metolius nuts if you really like the offsets).