Comparing the prices on both won't be a fair comparison. The R8 is being sold direct from China, while Pass Labs has a dealer network.
Secondly, break-in with Pass Labs is true. My F8 took 3 months to burn-in. After which, it's one of my favorite amps. My X150.8, about 1 month.
I'm currently evaluating a Kinki EX-M7, its an amazing amp. I recommend auditioning one.