i got mine about a year ago via my neighbor (he's licensed as resale & manufacturing) and i love it. they arent that expensive to manufacture or get licensed for. the licensing costs are the same as any other class III item, $200.00. depending on where you live, it can be quite easy. here in colorado the law enf agencies really dont care if you have it "if you ask". its the people that they dont know about that makes them uneasy.
i have found that i can maintain better groupings on the range for longer periods of time when i have it mounted. there is an obvious difference in the barrel weight of the weapon, but once accounted for it is quite easy to work with. i attribute the longevity to not as much 'chatter' going back towards my face (my receiver is padded as well) which elaves me less fatigued as the day goes on.
if you are a regular shooter of a smaller caliber (<308) i certainly recommend them for entended sessions at the range.
my 2 cents.
/edit : i can spell, i just cant type
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