I also have been sending my 3 year old son (well now he's 4) to preschool over this past year. He goes 5 mornings a week and he loves it! However, I am really really lucky as he got into a program in the school to prepare the kids for JK next year and it is free! So I got the best of both worlds. But, before I found out about this program, I had enrolled him in 2 mornings a week nursery school just for him to be with kids his age and get ready for school etc. And yes, he is the most challenging for me too, so I am not ashamed to admit that it is a really nice break. You will really notice the difference when he is not there! Mine starts school this September, so I am looking forward to full day school and no middle of the day pick-ups!