Nüobell 550
After a few weeks of using these - so far they are awesome! So easy to change weight with a simple twist of the knurled handle. They just feel right - balance and grip are spot on. And their beautifully refined design makes me want to use them.
Only downside is being mindful to handle them carefully. Manufacturer says not to use them for weight bearing - which rules out rebel rows and a few other exercises where solid single weight dumbbells would be fine.