These are my first pair of wireless headphones and Sennheiser are a brand that constantly produces the goods. As with most products I buy these days I spent time reading other reviews first and they were more than enough to convince me that these were cans that could do the job.
Setup was simple, insert the supplied rechargable batteries, place the phones on the holder and intially charge for around 16 hours - just like the manual stated. Then plug the base unit into your source, ensure the base is not at a low level, turn on your phones, volume up and away I was.
Sound quality was excellent but then I expected nothing less from Sennheiser. Next I walked from room to room, I do only live in a flat so am on the same level but the sound quality was never compromised wherever I went. There is a switch on the base unit to add a "surround" effect to the audio though you only really get the experience with music or tv programmes with great audio - if using them with a tv.
There is a tuning button on the headphones and channel selector on the base unit in case there is a problem tuning into the required source but on initial use I have not had to use these options. The headphones also have a couple of built in technical tricks to ensure the sound quality isn't affected by various source/interference issues.
Although large the cups are very comfortable and grip the head nicely, the overall quality is top notch and the product comes with a 2 year warranty.
I can see these being almost permanently stuck to my ears, its refreshing to buy a product that is straightforward to setup and does what it says it does, after only a very brief time using them I am more than impressed.