First chain I broke myself. I shifted while climbing (powerstroke) and it took a couple spokes with it. It was the stock KMC chain.
This chain has broken 4 times and I've used up all my spare links. So it was only one chain from one vendor. I'm going to a SRAM 10 speed chain from MEC for now. I have no confidence in the chain and when I'm 40km from home that's not fun.
Are 28 inch quads "massive" to you?