I got the 250 (C version) maybe three/four years ago and just used it for the first time this past weekend (!). I have no idea how the pictures will come out -- it's true that f5.6 makes for a darkish viewfinder. Its main drawback is the long minimum focus, it seems, but I might have made that worse in the opposite direction by putting a Proxar on the front. This is all handheld, so it'll be interesting -- very high magnification, close focus and a dark finder. But I like how the lens handles; it's really not heavy for its dimensions.