First off, I weigh 180 lbs and am 6 feet tall. After wearing my Galco Miami II for several weeks with and without the tie-down straps, I can safely say that the straps are completely unnecessary unless you hang upside down a lot.
If your holster and mag-carriers are tightened to anywhere at or above halfway between your armpits and your beltline, then they will never move, even when you are running and jumping fences.
I hope this helps some people save $20. I wish someone would have told me before I spent the money.
Pros: It does what it says it does - attaches your Galco holster and mag carrier to your belt.
Cons: You don't need it
This review was written in the old system and had content requirements that are different than reviews written today.