Summary: I purchased this unit and after about 4 months time it malfunctioned and produced no audio. Because the unit was under warranty, I sent it to be repaired by one of Onkyo's authorized repair facilities. They took 3 months to get it back to me and when I reconnected the unit it only lasted ONE day before it broke again for the same reason--no audio.
Summary: I purchased the silver SR-605 and started using it in a simple home theater setup in November 2008. It performed fairly well at first, but maybe I only thought that because it was my first attempt at building a 7.1 channel system. The unit does run very hot and needs external cooling unless you want to risk a fire. It was lightly used, maybe twice a week and never pushed to its limits as I live in a townhouse.
Summary: I thought I had performed a thorough evaluation of home theater receivers, Onkyo seemed to have great ratings and a good "bang for buck" value. I however got a lemon, and have found out that 30% of the units are bad for HDMI operation. Google "Onkyo popping". My receiver pops after about 20 minutes of HDMI viewing, and the popping noise is very annoying and begins to increase. I had to buy an expensive fan to help reduce the popping, but this has not stopped the problem.
Summary: Bottom line of my experience is their service, support and warranty people have no interest in making a serious problem right. Up until my problem occurred I really liked the receiver, but once it failed the experience left a really bad taste in my mouth. I've owned the receiver for three months and the surround left back channel just failed and fried my speaker. Found speaker to be open circuit with a meter, smelled burned and insulation on internal wiring is melted.
Summary: Receiver's tuner and video card inop after 45 days. The unit was then shipped to an authorized repair center. The repair center indictated the unit damage "pointed to a surge" and repairs would cost more than a replacement and was not covered under warranty. The entire system was hooked up through a Monster HTS 3500 power center that had no indications of a surge and six other components were working normally. As a note, contacting Onkyo product support is a nightmare.
Summary: Don't believe the hype with this receiver. First off, HDMI 1.3 in a receiver is useless at this point. If your HD-DVD player or Blu-Ray player does the decoding of DTS-HD Master Audio or Dolby True-HD then the receiver will receive the signal as uncompressed PCM. The only reason this receiver has HDMI 1.3 is so that when High Definition players can send out the signal via bitstream the receiver will do the decoding and it will say Dolby True-HD or DTS-HD Master Audio.