This morning, I was dreading using this monster to flatten my Norton 4/8K combo stone. So I went ahead and drew my grid as usual only this time, the Norton 4/8K stone was BONE DRY. It hadn't been soaked or anything since the last use and it blew me away this morning. I was done flattening both sides of my stone in less than 2 minutes. If I had soaked the stone prior to flattening, it would have taken at least 10 to 15 minutes easy, even if I had let the thing dry for about 2 hours. So for those that use a flattening stone of any kind, flatten them under cold water when they're BEFORE SOAKING THEM:
I was very impressed this morning with this flattening stone.