I have an MC402 on my main system and an x250 on my bedroom system. They are fairly different. If you want smooth and listenable for long periods the MC402 is what I'd recommend. If you want more dynamics and detail with the little thickness (in a good way) on the detail go Pass.
The Pass puts off a lot of heat compared to the 402. The Pass has the same delicate middle as Ayre. I think if you A-B'ed Mc and Pass you'd immediately know which one you liked better. They are different sounding amps. You wouldn't sit there and think they are all that similar. The 402 has a higher WAF.
Reno hi fi will let you trial a Pass for 30 days with a minimal restocking fee.
