Summary: I was really torn about getting this vs. the 608, but after reading about some issues with the 608's signal processing, I decided to save some dough and get the 508 (I really only need 2 HDMI inputs for my media room anyway). Boy am I glad I did.
Summary: I bought this to replace my Sony receiver I purchased from Amazon 3 years ago (almost to the day). While there was nothing "wrong" with my Sony receiver, I quickly realized once I plugged the Onkyo in, that my surround speakers were not being utilized as they should be.
Summary: This reciever is so good I can hardly believe it. It is perfect for my surround sound system for my 55" Hdtv and 7.1 Onkyo speaker system. It is perfect for a relatively high end system for low end money. You would be crazy not to look at this receiver.
Summary: Great receiver. I found that many negative reviews here are user's faults (except for some factory defective units). I was able to fix many problems by googling and reading the manual. 1. REAR SPEAKERS in 7.1 configuration DON'T WORK. Dolby EX is off. Reason: Zone 2 is accidentally turned on.
Summary: Okay, if more must be said, then how about this: 7.1 channel audio and full HD picture (even supports 3D picture) handled effortlessly. All devices connect to the sound system, with just a single cable being needed to link the receiver to the television to provide high quality video.