Summary: Got this one because of few reviews i have read and the listening tests. One of my main reasons for the purchase was the use of burr-brown converters in a very affordable box. Most other manufacturers use those converters in higher end models. Listening to music and movies on the 5.1 setup was good. Converters sounded very good, the high end definition was better and overall freq response was good. It has good balance of features and the build quality is ok.
Summary: I needed a receiver to pair with my new 2.1 speaker set from Monitor Audio. Having invested much into those, I didn't want to spend a ton of cash on a receiver. At the same time, I didn't want to skimp out and not get the most out of my set. The Onkyo NR509 provides an ideal balance of performance and affordability. I have my computer and cable box as occupying 2/4 HDMI inputs and I have my Wii occupying a component cable input.
Summary: I purchased the 509 as a secondary unit. I have been very impressed so far with its features and how it works. I have been buying stereo equipment for over 40 yrs now and have progressed from mono to stereo. From stereo to quadraphonic(I still have my marantz systems) and in modern parlance, from 2.1 to 7.2. This receiver just works. I like the net compatability which allows me more input into what I listen to. It is reletively seamless to use all of its features.
Summary: Forget everything you hear about this receiver being difficult to set up or having a confusing remote. For anyone with a rudimentary understanding of audio equipment, it's pretty intuitive. Sure the manual could be better written - there's virtually nothing about connecting to your home network wirelessly for instance - but a little time spent figuring it out or even searching YouTube for a few answers can get you past all of that.
Summary: I eventually settled on this receiver when I built out a 5.1 setup down in my living room. I have it's big brother - a 7.2 channel, THX monster that is three times the cost - upstairs in my media room but didn't need that level of quality/features for this, nor did my wallet need that level of emptying. For the price, this is hard to beat.
Summary: I did my research before buying this Onkyo TX-NR 509 receiver. It is packed with great features for the price. I particilarly like the wireless feature. The only drawback is that you can't listen to internet radio and watch program on your TV at the same time.
Summary: Configuration Speakers: Bose 5.0. TV: Sharp 42 inch. Remote: Harmony One Wireless Audio: Airport Extreme + Iphones Blue Ray Player: Samsung XBOX 360 Setup The setup: Easy. The network Setup: Easy HDMI throughput: No glitches Airport extreme wireless input: easy setup, clear audio (better than on my older yamaha receiver) Note: the set up mic was a real pro, I have an odd shaped room and it was able to balance it out much better than I have on my own in the past.
Summary: Be aware, this will not convert your analog signals to digital or the other way round. If you have only an HDMI input on your TV, everything video you connect to this must be HDMI. This is as expected with an entry-level unit, but something to be aware of. The sound is good, if a bit underpowered. Setup is fairly standard. Every now and then it doesn't talk to my TV. I suspect that the problem is the TV's fault.
UPDATE: ARC HDMI capability is a hidden gem in this receiver
Caveat Emptor, Amazon
31 July 2011
Summary: UPDATED Oct 2012: After recently purchasing a 3D Samsung TV with an audio return channel (ARC) HDMI port, my satisfaction with this receiver is even higher. As described on p. 48 of the Onkyo manual, "The ARC function allows an ARC capable TV to send the audio stream to the HDMI OUT of the AV receiver.