Also, bluetooth technology that is popular in the cheaper models suffer from interference. So does the IR ones. However, the Senn RS220 uses RF and transmits over a broader band (apparently CD quality audio) with redundancy to eliminate interference.
I'd go the wireless route. Why have a chord to possibly get in the way...
For listening to music I like the full cups that exclude outside sounds.But for playing piano these are too heavy. I like a much lighter weight foam headphone that let sound in but are more comfortable for a long practice session.Testing a set of headphones for five minutes really doesn't tell you what it will feel like after 45 minutes of playing and moving around.