The Shimano UN55 may well be the single best deal in bicycles.

I refurbish old bikes for a living, making cheap, dependable bikes for people. I've never found a dead UN5x. I just plugged a UN51 I took out of an ancient and thoroughly demolished mtn bike into another bike bc it still turned perfectly. The only stories I've heard of killed UN5x BBs were from people who used them for years, if not decades.

They're amazeballs.