Thanks all for the replies, all really helpful input! To get a feel for how I might like AIWB I took one of my current holsters for my G43 and moved the clip to different holes for a straight drop and tried that AIWB. I didn't find this very comfortable at all, definitely worse sitting than standing. Sitting the muzzle pressed into top of leg and back of slide into stomach/bottom rib. If I pulled holster up a bit as sitting down and didn't lean forward much it wasn't so bad. Standing wasn't great, but I guess tolerable. Grip stuck out obviously since nothing pulling it in, but was more interested in getting a feel for comfort.
Do you all think this holster can give me a decent idea whether I'd like AIWB? Or is this not even comparable to comfort of a purpose build AIWB holster? Based on finding this not very comfortable, any thoughts on options/features of an AIWB holster I should look for that would be better for me? Thanks