From the website
The Snap-Loop belt attachment is an improvement I really like! A very practical outside-the-waistband design allowing the holster to be put on and taken off easily. No need to unfasten your belt, thread it through all the trouser loops, etc.
Seems like a good advantage if you need to take your gun on and off during the day.
I don't own one, but given my carry habits, I would consider one if it were IWB. I wouldn't use OWB for most carry applications.