I had the 10X10 already built for my mower and some tools. I ran out of work space on that small table, so I built a lean-to on the side of the shop and moved everything into it. It's off the ground with good flooring, but I wish it was concrete. If I ever get the chance to build another one, it'll be at least 12X12.
I have one. The proverbial 20 pounds of shit in the 5 lb sock. Used to be nice, but am afraid it's past the tipping point.