I recently bought the HT-E6730W/ZA from BestBuy store. I got a good deal on the last new unopened-box from the store for $650. I love the system, very good crisp and clear sound and decent bass. I updated the firmware and the browser and installed the Naked Trailers app. i do not experience any lag or sync issue in audio while watching trailers on Naked Trailers. Did not try Netflix yet. I use the Panasonic P60ST60 TV with HDMI cable from Saphire (with directional sound and Ethernet support) connected on the HDMI-ARC port of the TV. When I turn the TV ON to Antenna, the system recognizes the TV and plays sound from the TV automatically. Also, the TV mutes the internal speakers automatically when this happens. Changing volume can be done either with the TV or the HTIB remote. Really nice! No audio lag there either. Also, some antenna TV shows are presented in 5.1 and it works great, all through a HDMI cable.
Many people complain that this is not a true 7.1 system, but looking at how many speaker plugs there are in the back of the unit, I dare to contradict them: there are plugs for Center, Left, Right, Subwoofer, Top Left, Top Right and a Wireless card that connects Rear Right and Rear Left. Doing the math, that's a total of 8 separate speakers/channels (hence 7.1). The Left and Top Left and Right and Top Right share the same enclosure, which I am fine with it because the Top speakers can be tilted to point to the ground or the ceiling causing a sound reflection and surround effect - in my opinion this is better then having another set of speakers to hang from the wall. When I installed the system I did not have to put a nail in the wall, no holes for the wires, nothing - which is perfect, installation is quick and easy and won't be a hassle to move the system to a different room should I ever need to do that.
The web browser works much better than the one in the Panasonic TV, it actually supports Flash. The menus are also faster than the TV, so I am happy I purchased a different brand than the TV, giving me more options to watch online content. The Samsung remote is also much better and intuitive.
If you are on the fence with this system, go for it. I noticed that Amazon does not have it in stock and it's pretty hard to find on other stores too.
Watch-out for ridiculous prices though, I would not pay more than $700 for it at this time - and, according to the BB rep., it is supposed to go down in price even more soon.
The fact that Consumer Reports is recommending this system, also played an important role in my decision. At this time, it's the only HTIB system with blu-ray that they recommend.