Great Product / Pairing is a bit of a challenge
Crutchfield Customer Review (What's this?)
The HDR 180s and 170s are my go to wireless headphones. The 170s are better for when I want to block everything out, the 180s are a bit more comfortable but have sound leakage and do not noise cancel (which is a pro and a con depending on environment).
Pros: Long battery life, great range, little to no interference, sound quality is excellent, price point is good (especially since they are being phased out).
Cons: A bit tricky to get the hang of pairing these (instructions on pairing could be a lot better). Tried and failed and called Sennheiser and now got the hang of it and have 4 paired to one base. Pairing to a RS180 base and you lose the bass boost / surround features but unit does work.