Overpriced Izumi chains are nothing but hype. Who cares it they are "unbreakable". I've never broken any kind of bike chain. Durability is more relevant and I just got a whopping 400 miles out of my new $50 izumi ESH chain, until it was stretched well past 1/16" mark and closer to 1/8". I used it on a 100% new drivetrain (EAI cog + Sugino Zen chainring) and cleaned and lubed the crap outta that sucker and only ever road it on dry pavement. I'm going back to cheap-ass KMC and SRAM PC1 chains.