I've got the Zule LS and am very happy with them. In fact it was the Flyer test which convinced me to get the LS over the Bose-X for several reasons:
-The non ANR noise reduction is better in the Zulu than the bose-x. If you every have to fly without ANR on, this could be a factor.
-The Bluetooth capability, as well as other inputs, like Ipod with auto music muting facility.
-The ANR is fantastic, as good as the Bose in my opinion.
-They were $150 cheaper.
I'm glad I did, I have used both the Bose-x and the Zulu LS and I'd go for the LS any day. The Bose is a little lighter but that really doesn't make too much difference to me. Both are comfortable.
Bought mine online from Sporty's and saved well over a hundred quid when delivered to my house over the UK price delivered.