The Sunrise AS-Charm surprised in more than one way. Like the Yuin PK1s these earbuds feature a driver that is hard to drive but sounds very nice. If you can live with the earbud form factor these are just as nice as the PK1s, but come at a much cheaper price. For $80 these earbuds are a steal if you match them up with a good DAP/PMP or other capable device. Since they are hard to drive they tend to sound better when driven by a headphone amplifier. We have tested them successfully with the affordable FiiO E1 and E5 with great results.
For the budget setup I still prefer the AS-Feelings to these due to the fact that they do not need an amplifier.