I have owned a RS180 for a few days now. I am not an audiophile but I appreciate good sound quality. I have owned several different Sennheisers in the past, these sound better than any other models I have owned to date. Extremely comfortable fit. Here is a mini review:
The setup manual was very limited information. It basically was a quickstart manual in 20 languages. The batteries are standard sized rechargeable batteries, not a proprietary size.
The sound quality is fantastic. No complaints. No hiss or noise of any kinds. The only audio problem I had was that the audio was dropping for half a second every now and then. I attributed this to perhaps interference from with the transmitter and some other equipment (wifi radio, computers, servers, tvs, dvrs, etc nearby). I tried moving the transmitter to a new location and it seems the audio dropouts have totally stopped.
The unit comes with an in depth manual, the PDF is online. You can add multiple KLEER devices to the transmitter. If you are experiencing issues, Sennheiser recommends doing a "manual pairing" and it may resolve issues. I tried doing that when I was having the dropout issue.
I love how they recharge by placing the Sennheiser on the transmitter. Excellent design!!
My only annoyance is that the transmitter goes to "sleep" after a few minutes of inactivity. Presumably this is just to save energy. This is a bigggg annoyance for me. I would rather not have to walk over to the transmitter to have to power the transmitter on. Perhaps someday I will hack the transmitter to bypass this issue.
Looking forward to reading any other reviews... this seems to be the first one I could find anywhere?!