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I have a pair of the Bose QC35's, not the Sennheisers but...
Firstly, considering they're wireless, from Bose etc, they sound fucking fantastic. I've had B&W P5s and P7s for the last couple of years and they are certainly comparable if slightly less warm (though this could be because they haven't loosened up yet).
Secondly, noise cancellation is incredible. Plans, trains etc are pin drop quiet and the battery life lasts me at least three days of listening in the office.
Finally, the range is awesome. I can leave my phone on my desk and wander around the office without dropout (~10-15m).
100%..probably one of the best all time products I have ever bought. Don't even question the price tag. Went for the larger over ear ones. Was staring at a 12 hour flight with a set of beats mixr wired that ache from wearing after about 2 hours. Was a good decision :)