I'm trying to pinch every penny until it squeals here. I've got the 220, 1500, and 5000 Shapton Pros and I'm tired of the mess and hassle of the way I'm flattening them now. I'd like to buy a Atoma 140 off Amazon and use that. Everyone seems to agree it's fine for the 220 stone but a lot of people talk about switching to the Atoma 400 for stones above 1000. What's the downside to just plowing ahead and flattening my 1500 and 5000 Shaptons with the Atoma 140?