Mama R is thrilled with it. See, she's smiling!
Actually, I'm quite thrilled with it too. It is soft like a pillow.
Besides the pillowy softness I'm also thrilled that it is
Mama R requested elastic all around the edges. It turned out nicely but my fingers are sore from all that stretching of the elastic. I couldn't say no to her request because she was an amazing assistant with this project. I honestly wouldn't have been able to complete it without her help.
All that is left to do is test it out. I'll find out the final verdict tomorrow.
UPDATE: The mattress cover passed the nap test.