The clips I use now are velcro. I started with the standard 'over-the-belt' clips. The standard ones that come with The Answer will really grip a belt -- but they are very visible. With the velcro clips, the holster is next to impossible to spot. I carry a Glock G23, which is a compact .40 pistol (but not a sub-compact or "baby"). Since the magazine is a double-stack, the gun is relatively thick, but the compact model has a shorter barrel than the G22 standard 40 caliber. Dimensions are width - 1.18 inches, height - 5 inches, length 6.85 inches. I have no doubt that any good IWB like The Answer can conceal up to a full-size 911, but this compact is a little easier to hide and lighter to carry.
Concealed carry is very comfortable. I carry all day every day. My work involves me sitting at a chair on a computer, and the 3:00 position works well for that. I also have no problem getting in and out of my truck. And I spend time in the pasture every day doing things with my horses. I often show my horses at public events like community festivals and exhibitions. Some of my horses are miniature horses that are jumpers (one has two World Championships in that) and this means that I must jog beside the horse as I lead him over the jump course. I carry during these public community events as well, and no one has ever noticed. The holster keeps the gun secure by my side while jogging with no bouncing or extra motion.
I usually wear an undershirt, so the holster is not against my skin. Getting hot and sweaty (even here in Texas) has not been a problem. When I do (occasionally) wear it directly against the skin it is still fairly comfortable -- but I prefer have an undershirt between me and the leather.
I have no doubt that other top holsters like the Super-Tuck are just as good -- but I have been very, very pleased with my "The Answer".