The answer is:
My personal experience:
Well, I have never sanded any floor to be honest. I didn't need to :) Each time I moved into a new flat I invested into panels :) Since I like laminate wood planks, I have never thought of anything else even though I had enjoyed a glued parquet flooring...
Here's a link on how to sand floors :)
My question to you:
Have you ever sanded your floors? Are you good at it? Any practical tips?