I haven't posted here before, but have really appreciated all of the good advice and information I've read so far. I will begin using Calvert's curriculum for my 1st & 4th graders this year and didn't initially opt to buy the Advisory Teaching Service, but am now having second thoughts. Would love to hear from any Calvert parents on why or why not purchase it. The extra cost seemed pretty high, but now I'm thinking that I'm making it more complicated for myself by not purchasing it. And that's what savings is for - sort of. I'd think I'd also appreciate having the "official" grades/academic record in case we move someplace or have a life change that won't allow homeschooling. Thanks for any input you can offer.