Two of the guys form HSL have split and become HISL, it might be worth looking at what they're now producing
We have Alphas on the Police Air Support Unit with ANR fitted as standard but I cant stand the feeling of the constant thudding in my ears, so I use a jack plug and revert it to a NATO.... pure bliss.
However you do have to ask, we fly an absolute maximum of 2 hours due to fuel, normally it a 30-40 minute tasking.....do we need ANR?