The speaker enhancement is, not. It made my speakers (I actually had a model they supported) sound more muted, like they were behind a piece of sheet-rock. Maybe that's the effect they wanted, I don't know.
MS called me and they were doing a poll on Plus! I told them them it was BAD and said that it simply didn't have enough features (if you call what it had "features"). They told me about certain features they were thinking of putting in the next version and they did sound pretty great. So wait for the next one.
BTW: I uninstalled it the same day I tried it.