For what it’s worth, I’ve got the FAST installed for all of 24 hours. I think Sensei @SouthNarc is right. It is the way. For me, it means I can lose the heavy folding irons I had on there, and I’m being persuaded on the heads up posture of the high mount. One small benefit for my use case is that one handed aiming is a *lot* easier on the high mount.
Hopefully I can both sight it in and continue to contribute to my 401k at the same time.