There are the good and the bad sides of it. The bad sides include: Forget about a good nights sleep for about three years or so.
For the same amount of time you can forget any proper time on your own, long holidays with your spouse, the comfort of double income...
Kids are EXPENSIVE. Also, the first two years after they're born and the first year after you put them in the kinder garden, you'll be visiting doctor on weekly basis.
I hope you don't mind changing dirty nappies hundred times a day? Wiping spit off their chin and off your clothes? Holding the little bundle of joy next to your chest and discover he chose that very moment to pee?
Not to forget that the moment they start toddling, your house will be a DIRTY, messy and LOUD dump/children playground.
Having kids requires nerves of steel, immensely strong stomach and infinite unconditional love.
On the other hand, if you can get past all this and if you have the support of your partner, there's hardly anything nicer, any more proud moment than watching your child first steps, seeing his eyes glitter when he brings you a flower, telling him stories for good night...
Think of kids as of a really intelligent, really demanding pets. Are you up to the task of helping them grow into responsible, independent adults?