One caution though. Some IWB holsters don't work well with the extension. I have Supertuck and the .2 always got hung on the leather when reholstering. The .1 extension is better but it's worn a groove in the leather and I have to use a finger to push the leather back when hostering.
Just something to consider if you have an IWB holster.
It's not quite that cut and dry or at least not for me. The snag actually prevents the gun from going into the holster and repeated snagging slightly distorts the top of the leather exacerbating the situation. In one of my last classes I probably drew from the holster over 100 times and it was a royal pain after about 4 hours which is why I went from the .2 extension down the the .1.I'm not concerned about a snag on re-holster.