I had PLANNED on waiting 5 years after....that being said, I was preggo in 5 month and my kids are 14mo apart.
That being said I have no other children so I only know how hard it is to have kids 14mo apart.....so I have nothing else to compare it to (like a mother who has kids 3 years apart then 1 year apart).
They are the best of friends, we got rid of Baba's, nuk's and diapers together. They share clothes (one wears 3t, one 4t, but can often swap if needed), toys (well we get 2 of everything so they don't fight, but they are pretty much on the same level).
The downside is that I feel like I never got to enjoy them being babies....I was preg when my older was a baby, and when my baby came, I was running after a toddler (and dealing with severe PPD). I sometimes feel like I am spread thin with the 2 of them needing me (esp when they were both younger).
I have no clearcut answer for you, it is a personal decesion that will work out for your family no matter what you decide!
Good luck!
Star