David Scott,
Have had my "tuckable" Springbok holster recommended by someone who posted his opinion about 6 months ago.
This is my first Kydex holster. Going to try some different ones soon.
Strength? Rigid and fast...good retention.
Weakness?...rigid..not forgiving if not located properly.
I'm chunky,but bony in the wrong places, so when rigid kydex rubs against bone or when I jumped into car too quickly one day...yow!
But overall, I like Kydex if used properly (really fast draw.) Springbok is pretty fast in getting it to you,too.