I've never met anyone who was sorry they had children, but I've met a lot of people who missed the opportunity (to be fair, I've never met the parents of a violent criminal).

Kids can be hard, especially if you're not a natural, and especially when they're young, but-- it's impossible to describe the fulsome love I have for my kids. I'm not a sentimental person, and probably wouldn't have had them without my wife (which is a funny thing to say). Even when they're a pain and a disappointment, even with the ever present guilt, my kids give me some baseline purpose for free. And the wins are great--"all joy and no fun" as I heard once. The conversations as they become real people. It's impossible to describe and totally worth it.