I've had mine for a few weeks now. This is THE buy @ $549! It has the sound quality of much more expensive AVR's without all the BS that comes with them. If you want internet, USB and 50 different surround formats, then this is not your receiver. If you care about sound quality first and can appreciate a more minimalist approach to your needs, then this is the one to get. I haven't used any legacy ports for a few years now so not having many is no problem for me. Using only HDMI fills my needs. I also use Apple TV so I can stream anything I want to. What's nice is the two zone outs. The 2nd zone has a separate DAC so you can sent another digital signal to that zone out that is independent from the main channel. Both zones will output the HDMI audio on the main channel. I know a lot of AVR's can only use an analog input for this. I love the auto calibration set-up that the 8100 has. You also have 11 bands of parametric EQ on each of the 5 surround channels and 3 bands for the sub. I was able to fine tune the auto calibration even more with my RTA and calibrated mic. It also has 3 internal cooling fans in case it gets really hot. Mine only gets moderately warm during use. The 80 watt rating is VERY conservative. It has much more headroom and cleaner sound than the higher power rated Yamaha receiver it replaced. You also can't beat the 5 year warranty.
Samsung 55HU8550 TH02/SEK-3500
Denon X3300W 5.2.2