I currently own the 15lb stainless vertical stuffer from Gander Mountain... love it, works great. The only draw back is that it's a little overkill when you want to stuff like 2 or 3 lbs of sausage. I find ~1/2 lb or more gets left in the bottom which isn't bad when you're doing 10-15 lbs but is really pretty wasteful when you're only stuffing 2 lbs.
Do other people find the same thing with their 15lb vertical? Should I be using more water? I was thinking of getting a 5lb grizzly for small batches but wanted to make sure I wouldn't have the same issue... based on the other threads it seems like the 5lb grizzly doesn't leave much left in the cylinder. Also does anyone know if the tubes are compatible?