I carry a 21SF in cooler weather using a Galco Summer Comfort IWB holster and usually covered by a vest. If I am just using an untucked shirt, I will usually carry the shorter 30SF or the 36. I consider the 21SF (and its brother the 20SF) to be excellent belt and / or car pistols and carry them when I am in the field. I like the longer barrel hand higher capacity when the potential ranges could be longer, or if I have to shoot through layers of clothes (which is why I often carry the 21SF in the winter). I like the shorter 30SF when I need to clear the holster in the minimum amount of time.