I've just finished doing research on a lot of the daycares in McKinney, so hope I can help. I toured Children's Courtyard at Stonebridge and Eldorado, Merryhill (Market Street parking lot), Primrose of Stonebrooke on Virginia, and Daffofils down on 720.
I had heard great things about Daffodils so was excited to go see it. I didn't get a very friendly person when I first called, but I still scheduled a tour. I just did not have a warm fuzzy at all. The school was so quiet when we visited no sounds of children having fun. My husband and 19 month old daughter came with me on the tour. Not one person acknowledged that my daughter was even there. So as soon as we walked out both my husband and I said "No way".
Next up was Merryhill. The school seemed very run down and old. Once again, no warm fuzzy.
We finally visited Children's Courtyard and Primrose. My husband and I both loved both of these schools. Primrose is slightly older but the staff were extremely friendly. My neighbors daughter has been going there for the past couple of years and loves it. We really loved Children's Courtyard. It is brand new, clean, loads of toys and all the staff are warm and friendly. We ended up picking Children's Courtyard as it is on our way to work. We have been going there for about a month and are extremely happy so far. I would definitely recommend that you tour both Primrose on Virginia and Children's Courtyard.