Echo Buster or ASC for room treatment?

Hi, I need something to treat echo problem and bass management for my room. However, I don't know which company is good Echo Buster or ASC. The Echo Buster seems to be a little cheaper than the ASC. Does anyone use of these products, please give some feedbacks? Should I spend more on ASC or Echo buster is good enough? Where can I get a best price on these products? Thanks for your inputs. DT