I got this same unit back in July... and despite the negative comments in the forum (as well as a few here today) I have to says I've been really happy with mine.
Setup... well that depends a lot on what you're connecting. Every source I wanted to add was HDMI; there are two PC's, an XBox 360, and a Blu-Ray player in my setup at the moment. Connecting it up, it replaced a 15 year old Harmon Kardon setup. As a result, there were no new speaker runs or anything; I just hooked up the ones I had. Yes, the Onkyo is capable of 7.2, but I have it set up for 5.1. Anyway, once it was cabled in; no problems. It powered right on, and I used the included microphone to set up the optimum sound balance.
Now performance. This thing sounds beautiful. The HK it replaced was fabulous for very warm sound, but did lack a little at the top end. Well, even with the same HK speakers, this unit found those missing highs. Tuning the sub has been a bit of a chore because the output seems quite different in the Onkyo... but given the age of it I might replace it anyway. Output from any HDMI digital sources is very clean with just the right amount of warmth.
As for the extra features... well I have used the 'Net features a lot especially Pandora. Especially when having a dinner party or something it's nice to have some music going quietly in the background... Pandora's perfect for that. Being able to control it with an app on my smartphone is freaking awesome BTW... likes, dislikes, skips... and changing source if I so desire.
The Bluetooth is not the greatest though. BT audio is rarely fantastic, but I get a lot of choppiness even when my Macbook Pro is sitting 5 feet away running BT audio through the Onkyo. Better to use DLNA over the WiFi for playback.
Now, how will the longevity be? Well, this has been what... six weeks? So far so good. I have not had any trouble with blinking, sound dropouts or "the hum". The only sound dropouts I've had are actually a bug with one of the two PC's I have that output sound via HDMI. A simple reboot of the computer fixes that.
For the price, this really is a fantastic unit. Granted I'm coming from positively stoneage technology but I have been incredibly impressed both with the feature set and the sound output. While it's a little odd at first when you have the surround processor dialed in properly with the microphone for tuning... you quickly become accustomed to it.
Also, for $329? I'd say pull the trigger. It's a great value at this price, and check around online; the repairs to the HDMI if it happens to fail are cheap, quick and easy. I've saved a few links just in case... but hopefully I won't need them.