Never heard the term auto -retension before, but I use a Blackhawk Serpa holster . It has the push button release to draw the gun. I have not found any cons personally, but some concerns over debris locking the button up have been presented. Also , others claim it induces AD's due to the use of the trigger finger release.
I see this as not true with my holster. My finger rests on the slide release naturally during the draw.
Finally , I like the added security of the holster. It is plenty tough.