I think you must have had an unlucky run-in with DRBT50's. Mine sound good, I woudn't say they're superb because I would prefer them to be a tiny bit more bassier however the mids and highs are nice. I must add that alot of other people who've reviewed them have also said that they're definately above the average pair of bluetooth headphones. What device did you try them with? It can make a big difference. Aside from that, tell me more about the Sennheiser PXC310BT's! What makes them so great? I want to upgrade from my DRBT50's