Pros: Good range, nice sound, mostly hiss-free
Cons: Can start hissing suddenly, in electronically noisy environment head position changes reception
The RS120 is a wireless headphone that receives an analogue radio signal, as such it is prone to interference from cellphones and is easily shadowed by having a TV or other shielding things in the signal path. This said, when they are getting a clear signal and the source is line-level and not amplified as from on-board sound from computers, they have no hiss while playing music and reaches ~50 m from the base-station without much distortion. The sound is very pleasant, it is slightly rolled of at both extremes of the sound spectrum and there is a slight mid-bass bump giving the phones a warm tint. The level of detail is what you could expect from phones like these, good but not great....
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