Bi-amping with different amps is not that easy to get it perfectly ballanced. I would not go for that.
I invite many of my clients to take a listen to my set at home. Because this is the easiest way to explain all different parts which need to be there for the absolute sound. In most situations there is always a part missing. So I invite them so that they can listen wha is missing. This works very effective.
Audio is my world, and I test on and on. It never stops. You need to test every single tool separately. You need to know each property it owns. For me it is very easy to understand the difference between a Mcintosh and Pass labs. I cab get all properties out of a Pass labs amp. I can garantee you that I can outperform any Mcintosch with it. Even for free I would not want a Mcintosh. Most people here at Audiogon do not have this level of insight. So I understand why the buy a Mcintosh.
When people of audioshops would be able to get all properties out of a Pass Labs amp they would sell a lot less Mcintosh amps. It depends on the right focus and knowledge!!