I've only had one 105 chain (so not a substantial sample) but it seemed on a par with SRAM/KMC but the convenience of the quicklinks (particularly the latter) @ a cheaper price wins hands down for me. As I said not a significant sample but my 105 (joined by a KMC link by the lbs) lasted 4500 miles (used all seasons but mostly selective winter days), it was still whole but I replaced it. The next SRAM chain lasted 4000 miles (spring, summer, Autumn miles) before I decided to replace it. The last KMC lasted just under 3900miles, in hard Autumn/winter conditions before I similarly decided as it wasn't fitting the chainring right, to replace it.