Have had both. Sold both, re-acquired the Okluma. Jeff's machining quality is superb and built to last a lifetime. When you buy from Jeff, you're paying for his lifetime, no-questions asked warranty. His customer service is the best in the business. You definitely can't say the same for some similar lights. The Sinner is good too, but the build quality of my sample was definitely inferior to the Okluma. I disliked the clip - absolute junk - and the threads didn't feel as smooth. Of course that's a byproduct of it being made of titanium, but I would've also preferred Grade 5 over Grade 2. The Sinner scratched sort of easily. I can't speak for Sinner's newer work though. His new version looks crazy cool and I've heard that the build quality has improved significantly relative to his earlier works.