Yes the Nicolai, the rear end had signs of cracking which after some effort, got them to replace it under warranty. They insisted it wasn’t cracked.
The second started to crack in the same place, 4 weeks into an alpine trip. It stayed in one piece for 6 more weeks of alpine riding, ended up with 4 small cracks in the back end. They designed and built a custom rear end to solve the issue, we’ll see how it fairs. From a small manufacturer the backup is good but you need to speak to them direct as the UK operation isn’t up to scratch. The 5 year warranty was the main reason I bought a Nicolai.
The others were an original Commencal supreme, (common swingarm pivot mount issue), second hand patriot (common shock mount issue) and a second hand stinky.
I’ve got a set of dh wheels as old as all those frames, still going strong.