Hi S.,
I found Kelli D's comments to be fascinating. I think the emphasis on academics in preschool is totally unnecessary, whether it is a Montessori or other academically-oriented preschool. What is the point of having a child memorize a lot of facts? They might be able to name the continents, but they don't know what that means! They have no sense of the globe, the size of the world, north/south, or anything else! So it is really useless information designed, in my opinion, to make parents think the preschool is "better" and worth the money, or to push kids far beyond their developmental needs. After all, what is the hurry in pushing them? Kids are over-programmed, over-scheduled, and pulled away from creativity and "down time".
A good preschool will teach your kids colors and numbers, maybe up to 20. They'll learn to observe the world around them - is it a cloudy day? Windy? Sunny? Snowy? More importantly, they will learn to separate well from Mom & Dad, to work in a group, to sit in Circle Time, to work/play at different stations, to share, and to negotiate their own space without hitting or biting or yelling! They'll learn to write their names and to recognize their name on a coat hook or cubby. They'll learn to line up at the first sound of the fire alarm, and to stay with the group when they exit. Those are key skills in kindergarten. If they can function in a preschool class of 12, then they have a good shot socially of blending in with a class of 24. These were the emphases in my child's preschool, and he did great in kindergarten. I am friendly now, years later, with his kindergarten teacher, and she still remembers him because he adapted so well and enjoyed the love of learning anything she put in front of the class.
If a child has a particular interest, it's great if the preschool allows him to pursue it during "choice time" - for example, my son was fascinated by dinosaurs and knew the names of a zillion of them. He got a lot of this from going to museums with us or watching shows on dinosaurs. When they studied them in kindergarten, he knew a lot more names than the other kids, and even helped his teacher with the pronunciation of "coelephysis" (which I can't even spell!) - but it was his INTEREST and not our desire to push him into learning facts. It didn't make him smarter than the other kids, and it didn't lessen his interest in school. Every kid has an area of "expertise" but it should be because they WANT it, not because a preschool forced everyone to learn the same things by rote.
It's much more important that children be able to master different skills (fine motor, gross motor, color/shape differentiation) and experience textures and the joy of exploration/discovery. They don't need to learn facts like continents or whatever. The reason this information is "not reinforced" as mentioned in the earlier post is: IT'S NOT NECESSARY OR INDICATIVE OF ANY TYPE OF INTELLIGENCE! The public schools don't care, because it's not important or relevant developmentally in the early grades. We don't really need to push our 3 and 4 year olds so that they are guaranteed to get into Harvard! In fact, even Harvard doesn't want fact-heavy freshmen who can't adjust to living independently and getting along with a wide range of people. THAT'S why my son's kindergarten teacher remembers him and enjoyed him.
So, good luck with your search. I would look more into stability/continuity in the staff, a developmental approach, and a warm & stimulating environment, and skip the academics for 3 year olds!
Enjoy this time with your little ones!