When I carry my 640 Pro it's IWB in a Remora holster. I was carrying a 642 until I bought the 640 Pro. Now it's in the safe until the weight of the 640 begins to bother me.
I also have a 640 Pro and it's a great shooter. It handles .357s well enough, but for actual carry I default to the incredible lightness of being that the 360PD provides.
It's my primary carry and always with me. I prefer AISW carry but can ankle carry if that's all that dress allows.
If it came to actual shooting I'd like to have this in the break front Don Hulme on my hip:
For better concealment but slower draw I can use this rig:
If I'm going to carry the model 69 .44 L frame I'll probably carry the 340 Pro in a left hand holster on the weak side to counteract the weight. I have also carried the 44 in a cheap Uncle Mike fabric holster AISW!
Not leaving the semi-autos out I have a 4040PD that is nice to carry concealed. Just the same as my 3913NL or my 3914LS but more power with the .40S&W. Here's my Shorty Forty in shoulder rig, It's still half a pound lighter than the .44 (w/ 2 extra mags):
No. When I'm not in pocket carry mode, my 60 no dash is secure in a strong side high rise pancake, or a paddle that allows me to easily crossdraw when seated.
I'm surprised there isn't more Galco Summer Comforts being used. Very comfortable. The snaps are a little more involved to use, but it feels more secure to me. 4:00.