i can honestly say that i have not dabbled in room treatments much. not because i think it is unimportant, but because my ht stuff has always been in a multipurpose room, rather than dedicated ht. there are a ton of factors influencing acoustics - primarily room size and shape. the thing that has caught my eye is the sheetrock that is designed for ht. i have not priced it (and there are several options), but it would look the most natural and offers good performance. what i would like is enhanced sound in the ht room as well as preventing sound to escape the room (and disturb neighbors, other people in the house, etc.).

my ht area now is a disaster acoustically and i have noticed a difference in perceived quality compared to other places i have lived, but i havent had the luxury to settle into one place long enough to dedicate what it takes to make it better. i will be moving again before too long, but then likely again, so its hit or miss. at least i am making progressively more money, so i can afford the treatments at all though!