4.5 stars. This calendar is beautiful and enjoyable to work on. I only have two issues with it.
1. I am not sure why February and May needed a separate supplemental packet for their drills. I would have preferred they each had enough in their own bags. I'm going month to month and disposing of the drills after. After February, I had to store the supplemental drills so I'd still have them for May and that was just an extra step I wish I didn't have to do.
2. The material requires a specific kind of pen to write well on it. My beloved sparkly gel pens could not. I found some I could use though.
While enjoyable, I definitely prefer a grid for diamond painting so that single placing isn't my only option. And your placement in certain images must be precise to not let the circle underneath show. Nevertheless, this is a wonderful calendar. I bought 2 and my mom loves it as well!