I have a 30-40yr. old K5a model.
Works for me.Getting a little old but all the toys work - meat grinder,grater etc.
New stuff doesn't fit it right though.
Needs new brushes too.
It is an up/down bowl.
Ours is the lift and its the most under used appliance in our kitchen. I'm going to get some attachments for straining and grinding and put this bad boy to some use.
I have an old K5a from back in the 60's. It is one tough S.O.B.! It has a bowl lift and so far all the newer attachments work. You can find them on ebay for a fair price.