I have one of the first Gen Shrikes, I was one the waiting list (with deposit paid) for about 5 years..
The Good
It works, I have, long and short barrel(for my RR lower)
Link are easy to find and I link my hand.. its not that bad (not like my 1919)
Very Light weight system
Drops on any Mill Spec lower (you will need to replace the bolt release (optional), buffer spring and add a buffer spring spacer)
The Bad
Some had stated the it is likes (or dislikes) certain ammo. From my perspective, mine did not like the really weak 223 Ammo, PMC Bronze was not 100% reliable, but Mil Surplus works fine
requires a "break in" period"
The Ugly
My rear take down lug sheared off after about 500 rounds. I sent the upper back for inspection. It took about 6 months, but they replaced the entire upper free of charge.