I have done side by side comparisons of the UP-4 and the DP-6. The DP-6 does sound considerably better, but it also costs more. I really do not like the ergonomics of the UP-4, too wobble'y. If the difference was only the sound then it would be a harder choice, both offer good sound for the buck. But when the ergonomics are factored in I think the DP-6 is a much better choice. I also think the 12" armwand is well worth the extra money if your table will accommodate it.