always heard all this good stuff about the 510's on bmx forums but never used one.
i've used k810 with a 16t sprocket for years now. when i rode 4-5 times a week i changed chains yearly, maybe every 10 months or something.
i can see why kool chains are shit for bmx with the massive side plates, but for trials they're ok. might go test a 510 if i feel like saving a few grammes.