I don’t know anyone who carries AIWB to gain half a second on draw time. There are a lot of reasons to AIWB carry that have little to do w draw time. Comfort & concealability come to mind. I used to love 4 o’clock strong side IWB but was a little worried during summer months, particularly I took my kids to the pool. With AIWB you never ever have to worry about someone to your side or behind you spotting something if maybe your shirt rides up, or it getting caught on an armrest of a chair when getting up, or when reaching in to the shopping cart at check out, when sitting at a high top at a restaurant. The funny thing is, my largest carry gun is the one I carry AIWB during the summer so I get the extra capacity too. I personally choose to AIWB with a hammer fired DA/SA semi w a decocker, I settled on the Springfield XDE (I don’t use the safety, the DA is more than adequate for me). After a little getting used to the DA, I just love the gun. I rarely carry the shield anymore, prefer the slightly heftier XDE and the extra round in the mag. And there’s no reason to carry without one in the pipe, there just isn’t.