I use LightSpeed 25XL's and Thirty3G's in my flying machine - therefore cannot comment directly on Zulus.
If they have bettered these - which they seem to claim - then they will be exceptional. The move to steel and magnesium over plastic seems sensible.
I have found LightSpeed's after sales service through Walter Mazanek of Audio Acoustics in Gräfelfing, Germany - absolutely superb. This aspect of ownership is very important when considering ANR headsets.
Would be very interested to learn if it works with bluetooth function in Thuraya SG-2520.