I've heard of people switching out the master link for a sram, wipperman, kmc, or whatever else they like, seemingly without regard for compatibility with the chain. I assumed it didn't matter.

Went to the LBS today, as I needed a new master link for a 10 spd KMC chain. He only had a SRAM Powerlock, and said he didn't think it would work. But it was only a few bucks, and I thought it would.

So who is right? Can I use the SRAM Powerlock with a 10 spd KMC chain? Are all these interchangeable, like I thought?