I'm a stay-at-home dad and have been for more than two years now. My kids are actually almost the same ages as yours (one's two and a half and the other 5 1/2 months). It can be really enjoyable. When you're kids are having a good day it's easier than a good day at work. It can be really frustrating and trying though when the kids are crabby. A huge downside for some people is that it'll really set you back in your career. For me, this wasn't an issue because I was just starting out and planning on going back to school to change careers anyways. The biggest tip I'd offer is make sure you have something separate of your children that you can do to relax.