Hmm, I’ve already talked about that. The HT5550 has several modes that are just fine for sports viewing, and for that matter, casual regular HDTV viewing. (I think of high production quality content like Game of Thrones as more movie-like than TV).
I didn't watch a whole lot of sports on it, at least not live. I ran through parts a few NFL games I usually use for the photo shoots, and found comfort on the NFL channel for fresh content, for just watching, without analyzing.
For lightweight HDTV viewing, I usually have some rear lights on in the theater. For that reason, I did much of my watching of sit-coms, dramas, etc using the untouched Vivid TV mode, for the punch. I also used Cinema mode (User) with its calibrated color, but not as often, as I'm usually working/writing when watching TV, and I like the extra pop of Vivid TV mode. Again, it is a bit on the cool side, but enough to actually be more enjoyable for my football viewing than a mode hitting the warmer 6500K target.
What's missing? Really only more sheer horsepower for watching with more ambient light, or a very large screen.
The BenQ’s smooth motion is never quite subtle enough for me for movie watching but I had no issue with using it while viewing lots of sports footage. I like the lowest setting, but then I’m conservative. Find the “smooth” setting that does it for you. Keep in mind, the higher the setting the more visible artifacts you may notice around the fast moving objects. You’ll want to find your favorite combination of smoothness and artifacts (they are fairly subtle, but enough to annoy an enthusiast, and probably unnoticed by a casual observer.