Most of the bigger stuffers can't stuff "meat sticks" so I kept the 5 pound model as well.
There is wisdom in this statement.
I tried stuffing some small sticks with my 7 lb Weston stuffer (rack and pinion type drive) with a too viscous mix, and it sprung a gear, vissually couldn't see it, but every revolution it would lock up. Replaced the whole gear set with a set from Walton's (they said on the phone it wouldn't interchange, miracle of miracles, it must have came from the same Chinese factory as Weston's, because it was a direct fit).
Anyways, unless you get your meat mix to a real runny consistency by adding a lot of water, the big diameter stuffers won't stuff the small diameter casings well.
I'd like a big stuffer for doing summer sausages and such, but am too tight to buy another.