I don't personally but I know a caregiver that does and has taken the various Casa levels of instruction. She also homeschools her own two children. Several daycares in my area say they use montessori techniques. If you look at it many of us do in the way we present activities even if they are only loosely compare to the programmed activities of montessori. I do like looking at what montessori offers as a guideline to some of what I do.