I finally got around to setting up and calibrating my YSP-4100. Comparing it to my Lexicon/NHT system in the A/V room, I was absolutely amazed at the sound quality of the new sound projector. Of course it didn't match the quality of the 7.1 Lexicon system, but for running no wires and easy hookup (~30 min), it is a good piece of hardware from Yamaha. Yes - it does require a sub (I'm using an M&K sub) and a square or rectangular room with few/no obstructions, but it is not extremely picky about that. The room I have installed in is rectangular, but also with an opening on one wall into another the room and it works incredibly.
Played "UP" and "This Is It" in DTS-HD Master Audio and it is amazing to hear the spaciousness and realism this bad boy projects. It really does sound like 7.1 if you sit in area where the calibration microphone was setup. The unit has memory to store many different configurations, so I am wondering if it's possible to do multiple calibrations in various seating positions. Center channel dialogue clarity is excellent.
I haven't tried the included wireless yAired subwoofer module and wireless iPod/iPhone adapter yet.
At $1900 MSRP this is a not a cheap piece of hardware, but you can find deals if you look around. TigerDirect is an authorized dealer and is having 15% Bing cashback today. The YSP-4100 is $1444.95 shipped free and no tax.