Sennheiser  RS-65 Wireless RF Circumaural Headphones with SRS Surround Sound Processor (Black)
Sennheiser RS-65 vs AR AW721
I just bought these and have a few obvservations that might be helpful.  I replaced the AR AW721 with these. The foam on the ARs were starting to break down and flake off after a couple of years. These have valour so should hold up better. The Sennheiser sound better than the ARs.  There is less static and the range is better. I think they are both comfortable with the edge going to the ARs because the ear foam is softer and a bit larger.  The Sennheiser is lighter weight which I like.  The ARs are a closed design and the Sennheiser are an open design.  You will hear more room noise with the Sennheiser than the ARs.  My daughter uses them to watch movies when we have people over so she likes not hearing as much room noise.  The Sennheiser is more money, better sound and reception, lighter weight, but are all plastic. I have concerns how they will hold up over the long run.  The AR is heavier, a bit more comfortable (especially for those with larger ears, and I think more durable.  Ours gets thrown around quite a bit. I bought an extra set so two people can listen at the same time. If you are thinking of a second pair I would recommend getting two COMPLETE units and not getting the ADDITIONAL second unit. The complete units are about twenty dollars more, but you get two addition batteries instead of one and another charging base so I think it's a better deal. I did audition the new Pioneer 800 5.1 surround sound headphone also.  They sound fantastic BUT they work on IR (line of sight) and the range was not that great and cut out pretty quickly.  I suggest you check these out is a store first if you are interested in the Pioneers.