I needed a soundbar for a 20x20 room for a Samsung 55KS8000 TV. My main requirements were 3.1 channels and HDMI ARC. HDMI ARC was mandatory since this is a living room TV that my wife and kids use (any extra complexity required to control the volume would not be tolerated). I initially purchased a Polk Magnifi Max at a local Best Buy. I had the Polk for about a week, which worked fairly well, but had two issues. The biggest issue was that high frequencies were almost non-existent. Midrange and bass severely overpowered the highs. The other issue was that the sound would often drop out when changing channels, taking 2 or 3 seconds to come back on. I tried messing with every bitstream/audio setting on the TV, and couldn't fix the issue. This was not a huge problem, but just noticeable enough to be annoying. I returned the Polk back to Best Buy (the return process was super easy, BTW) and listened to a bunch of other soundbars (much more carefully this time). I heard the same weak highs on the Polk display model that I was hearing at home, and was irritated at myself for not noticing this the first time. I really wanted to like the JBL Bar 3.1, but it had the opposite problem that the Polk had. The JBL had great highs, especially compared to the Polk, but absolutely no midrange. That led me to the Klipsch RSB-11. I had previously not considered the Klipsch because it was only 2.1 channels. However, it sounded so much better in the store than the Polk or JBL that I was willing compromise on my 3.1 channel requirement. A less expensive Klipsch model (RSB-8) also sounded much better. I went ahead and bought the RSB-11, which was basically the same cost (actually slightly cheaper) as the Polk that I had just returned. I am extremely glad I went to the trouble of returning the Polk and getting the Klipsch. I don't miss the 3rd channel one bit, as the Klipsch just sounds much better. Highs are far better, making dialogue much easier to hear. Bass and mids are great as well. Also, the Klipsch unit does not have the issue with the audio dropping out during channel changes like I saw with the Polk. The HDMI ARC work seamlessly, making the soundbar a perfectly integrated extension of the TV. I've heard that ARC can be flakey between different manufacturers, but it worked perfectly in my case with the Klipsch and Samsung TV.
The Klipsch is better than the Polk, for my needs, in almost every way. I will say that the overall aesthetics of the Polk (and JBL) are probably better. They are slimmer and less noticeable. The Klipsch is bigger and has a generally less sleek design. I'm assuming the larger size contributes to the improved sound. Also, the Bluetooth reception isn't great on the Klipsch as you have to be within about 15 feet of the soundbar to maintain a reliable connection. For me, these things are both of negligible importance compared to the sound quality and integration with the TV. I have had the Klipsch soundbar for about two months, and am still very pleased with the purchase.