My First impressions: The box is well designed, 2 years warranty, made in china, designed in austria.
Semi-open Price is good. Fits very well like 530Ltd (i have both) but smaller, it's very light, comfortable but the sound is not loud, the bass is weak. In my opinion should work fine on TV's, but definitly it's not made to Hi-FI audiophiles costumers. 18-20Khz. The batteries included are cheap. RCA - P2 cabe is long enough, quality OK. The plug is MONO VOLTAGE just 230Volts (germany) ... and not worldwide 100-240v
The base is beautiful, and need take care when you want to charge cause sometimes the headphone don't the contact energy, check the red LED.
The distance from the base I don't know yet, it's working fine around 20m.
I'm looking for some software to raise the volume in my itunes, trying SRS iWOW.
I have one wired porta-pro koss, and the sound is much louder.