We love Oak meadow here, and have been using it since K. We have beautiful main lesson books filled with my daughters work, like keepsakes. I like the creative expression interwoven throughout all subjects, and the attention to nature and art. we have not used them exclusively but use it as a sort of spine, to which we add lots of living books. We use the Charlitte Mason approach and find these two styles blend very well together.
I also like that it is project based and gets kids using their hands as much as possible, right now for 4th grade ee are stufying ones own state, and my dd is making a topography project of the area we live in. Shes learne how to knit, crochet, and so much more!
We still love and sing the songs several years later from the 1st grade curriculum.
We will continue to use OM in the coming years!