I have replaced the original bb on my bikes with a UN55. No regrets. Still have the originals in case I want to put them back on or as a temp if the cartridge type fails. Can definitely spend more for a little better bb such as interloc, but zero complaints. Meanwhile have had to service my non cartridge bearings 3x so far in the life of a $25 bb. I may have to build my next vintage wheel set with cartridge. I am not riding Eroica where I have to be period correct.