My friend has a set of these that came with his dell. They sound pretty good and also have the multimedia thx certification. The dolby digital decoding is there although i havent heard it. I doubt its as good as a real dolby digital decoder but its there. I'll be getting a set of promedias though simply because they are more powerful and there is no doubt that the sub on the pros is better. As for the dtts dont bother. From the other forums ive visited it seems the dtts just cant compete with the pros and the altecs.