These kinds of holsters have become popular among the Instagram shooting crowd, but it's not without good reason. I think T-rex Arms began making these popular.
I like the tab on the side of the holster that keeps the gun from flaring away from your belly, that's a huge improvement. I'm not wild about two things though. 1) The clips are less secure (a required compromise for tucking, sure), and 2) keeping the mag in the front. In my mind, your mag can take the backseat near your 7 or 8 o'clock and another weapon (a fixed blade for example) should be up front near your pistol.
But everyone has different needs, so this may work for some who's niches I'm unaware of.
You shouldn't be thinking 'oh God, I'm in a gunfight', you should be saying 'THANK GOD I'M IN A GUNFIGHT!' " - Gabe Suarez
"The man becomes the weapon, everything else is a tool" -Sonny P