If you do a search on these forums, and on the Secrets website, you should find some good info. I recall that a few forum members got to compare DPL II, Logic 7, Circle Surround, and maybe DTS Neo at Jim Fosgate's house. The Secrets review of DPL II also included some good comparisons, I think of the same formats. As I recall, for the most part the people preferred DPL II and Logic 7 over the other two by a pretty wide margin, although for most it was pretty even between those two. Circle Surround did better than Neo, which was almost universally considered the worst performer. Good luck with your search.