I have a 20 quart mixer at home, and I use it all of the time. Maintenance can be done by the local Hobart repair person. I use it for just about everything except when I am doing very small batches, and always with breads and Italian Buttercream icing. You need to ask what attachments it comes with - I have a dough hook, wisk, and paddle with mine. When I purchased mine, it came with a cart. It is not feasible to think you can easily move the mixer by lifting it - it is heavy! The cart allows me to wheel it into in a closet when it is not being used. You should also check to see what kind of bowl it comes with. If it is an aluminum bowl, then you will want to get a stainless steel bowl. Aluminum bowls will discolor some products, and may impart an aluminum taste.
I love my 20 quart, and would not be without it. This seems to be a good price, but if it does not come with attachments or a stainless bowl, be prepared to spend some extra $.