A friend of mine had some of these supplied by Rare Rims with his Rotas for his Civic VTi...they snapped!!
I've got some black RAYS durilium nuts on mine and they're strong as you like but the black anodising has worn off quite a few so they look a little shabby now, which is really annoying as they looked really nice around my black BBS centre caps! Also, if you use a socket with even the smallest amount of dirt in it, it WILL scratch the hell out them.
If you are going for coloured / ally nuts though, I'd recommend the RAYS purely because they have nice lockers with them that look the same as the normal nuts!