If this is the same kit flightsuits.com out in CA is selling than yes, I've flown probably 20 hours on it in a loaner helmet. CEP and a hush kit/softseals from OA are the way to go. The ANR eats 9V batteries like bite sized appetizers, leaving you only wishing for your CEP 8-10 hours later. If we could get lightspeed aviation to design an ANR kit for helmets.. that would be progress, but a bunch of $$ too. I'm really interested in this custom molded CEP's though
The ones sold by Gibson & Barnes (
www.flightsuits.com) are not the Gentex ones (G&B is infamous for replacing some of the Gentex items with 3rd party stuff when it comes to the earphones, visor covers, etc..) ...
G&B sells OEM versions of the ones made by Headsets, Inc. (
www.headsetsinc.com). The ones that Gentex supposedly sells to the military are actually manufactured by Racal Acoustics (
www.racalacoustics.com) (only reason I know this is i had spoken to guys at Gentex and Racal about this ~3 years ago)... but I don't see any reference to them on the website anymore. The one made by Racal for Gentex are not battery powered, but depend on aircraft power and are higher voltage that would preclude the use of 9V or AA batteries.
The ideal solution, in my opinion, is one that runs off of 2 AA batteries (like Bose Aviation Headset X or David-Clark X11) since you can use 8-15 min. rechargeable NiMH batteries without any problem and only carry alkaline as a backup. I'm hoping the G&B and Gentex considers it.