I have the 20 pound Kitchener model from Norther Tool. For a few pounds, I still go by hand. But on a 5 pound or more batch the mixer is the way to go. I have mixed a 3 pound batch in the tub mixer before, but I would just stay with hand mixing for that size in the future. I waited until they were on sale at Northern and used the $20 off $100 purchase coupon code (there seems to be a code for this all the time - just do a search in google). I'm lucky as mine will fit in our dishwasher when broker down. My 5 pound Kitchener stuffer will also fit (at the same time as the mixer). But if it will not fit in yours, and you have the usual sized double kitchen sink, it could be a PITA to clean. It's just too big to fit in most sinks.
So if you are tired of frozen fingers, watch for the Northern Tool model to go on sale and use a coupon code. If there is any difference between the LEM, Northern Tool, and any of the other models that size which I've seen, I can't tell it. I think they all come from the same assembly line.