I have a 5903 and really enjoy its combination of full size grip and slide and relatively light weight. I'd love a 5903TSW so I could hang a weapon light off of it, but I don't think I'll ever be able to track one down. I think I'd like a 5943/5943TSW for the same reasons, but I've never even seen one of them for sale (a TSW) let alone handled or shot one. Maybe I'll stumble on one one day be able to confirm that I'd like it.