Reply to thinking to upgrade to cdj's

hey guys i am wondering if i should upgrade to cdj's.
At the moment i have a traktor s2. This is a 2 channel controller. i have been using this for about 2 years now. Im believeing i should get some cdjs. i dj partys but not full on hard partys.....so far i have done 16ths and stuff
Please tell me what i should do. im only 14.......
i also want to know some answers to these questions-
- Can you use your laptop with cdjs
- is it good to upgrade
- What are pros and cons about upgrading to cdjs

Thank you