Not purchased from Amazon but decided Thanks to the recession for that.

Onkyo 636 (As of May 2015 replacement part successor to 150 more ... :-() and the Denon 2100er the competition were the one to beat.
Here read the recessions and advise the local dealer and let buy (15 cheaper).

Sound: Sound when Yamaha (as in the forums advice for me) Satter. Not overdone, perhaps was manually adjusted at Bass from the merchants.

Operation: On-Screen Menu - C64 I've read somewhere, also agrees. But it works. Yamaha APP on Apferln is super!
No weaknesses in handling.

Update: wireless set, Firmware Upgrade drawn (eternity) after restart and well.

AirPlay: Wau, was not a must criterion, the Onkyo would Ansonten equal denied from the outset. But more than just nice to have, now that I've tasted it I do not want no.

Why not the big brother? 677 2 zones function had no sense to me and I was including the front HDMI port 150 no criterion :-). The performance of the 577 is enough for my neighbors! Now the part only another 15 years as its predecessor must hold.