I'm super sad. It's a beautiful tub but mine arrived cracked severely in one corner so now I have to deal with returning a giant item, not fun.  The outer box didn't tell me right away that there was trouble inside so I had it sitting unopened in my foyer for a couple of weeks, but I'm glad I opened the box fully now. The bottom of the tub is rumbly but smooth.  So if you want a smooth bottom it's probably as close as you can find. It's not rough like sandpaper, just a bit bumpy.