Pros:
Its in Israel.
There is extra Kedusha here.
You get to learn how to take on additional responsibilities that you haven’t taken on before.
Separation from parents.
Learning Torah.
Easier access to shiurim and rabbis who live here in Israel.
Easier to get to the Kosel.
Cons:
It is a big step.
Takes time to adjust.
Its hard to be away from your family.
Homesickness.
Missing family.
Takes time to become familiar with Israel.
Overall, it is a great experience. You get to learn a ton of stuff. I have grown so much here in ways I would not have grown if I stayed in the states. You should totally do it!