Just to keep things real - I never said Arcam or Anthem or anything else wasn't good. The Arcam has its own unique sound and it is not my preference. I equated Class G to be similar to Class D in a sense because the higher power supply is "switched" on and off just like a Class D amp. The Arcam sound also has a very similar clean tone to Class D - which for me does not give a sense of life or realness - Conclusion is that it's lacking ultra high frequency response and "air".
I have not "demoed" or listened to Yamaha and others at Best Buy (which I agree is not the best place to listen). I have personal experience with Yamaha receivers and I like them, even though I would not buy one for myself.
Finally, there is a certain point of view that most dealers have which is to promote the gear that they sell. It's a commercial enterprise, so it is always in their best interest to buy something they have - regardless of their denials. Otherwise, they would commonly recommend something they do not sell.