I don't think those headphones actually have noise-cancellation. It's being advertised as "noise reduction," but I see no sign of the word "active." They just seem like ordinary closed, albeit wireless, headphones.
If you end up going corded, check out the Creative Aurvana Live!, Denon D1001, Shure SRH440. If you really want isolation, though, get some IEMs.
Also:
www.head-fi.org