I have it. We have used parts of the math and language sections so far. I think that the science stuff is fabulous but haven't got the materials together to do any of the science presentations yet.
It is a really great and pretty reasonably priced resource. I wish I had gotten the yoga, art, and sign language stuff with it. The four seasonal guides have a ton of ideas for daily activities, songs, and art, but I think if you were just looking for the basics, you could get by with the Supplement to the Guides as a really cheap way to get a pretty complete Montessori album.
I give it


I'm adapting it to work w/ my 6 almost 7yo, and I wish I'd had it when she was 3. The practical life presentations are really good, and there are presentations in there that I haven't seen online or elsewhere (bathing a baby doll, for instance, sweet!).
If you are hesitant that you will love it, then I'd say get the Supplement and see. But I don't think you will be unhappy with it.
The only criticism I have is that it can be kind of hard to find a specific topic if you are looking through the seasonal guides, because it goes day by day---and I'm pretty much incapable of following a schedule (or a recipe

) so I pick and choose through the books.
*eta* I hope you and your new little one are settling in well!