I really don't know of any real set backs, but I have had better luck running optical for sound as far as the newer formats go, my denon 3806 just seems to like it better, and I really enjoy the ability to stream music off other computers in the house and music/video from my readynas.
this beginning to sound like a svs site, but I will say I have two and absolutely love them, I upgraded from a 20-39 cs passive to a pb12/ plus 2 and even with a concrete floor in my theater room it is violent, I actually just put my 20-39 cylinder on ebay
my understanding is that for a much larger area in cubic feet, such as a room as opposed to a car. a ported enclosure is much more efficient which makes them cheaper to produce because you don't have to put 2000 watts to one twelve which is what you would have to do to get the same amount of...