Brazilian blowout (hair product), is it good for the hair? And would it ruin my curls? 10 points?

it works great if you have loose curls. however, if your curls are really tight, this is probably not the best for you. it does reduce frizziness, but if you ask me, 300$-400$ is not worth it if it washes out of your hair in a couple months. i have the yuko system, which cost me 370$, and it permanently straightens your hair untill new hair starts growing in. the only bad part is, i have to keep getting it touched up or else my hair looks weird with curly roots.