Prior to selecting any form of Martial Arts, one should do some research and make sure you are ready for the commitment. To become proficient in BJJ, the student must attend regularly, pay attention to detail, and participate. Belts are not "given" to students for just showing up to class.
Below is an older video, but it shows the advantage's BJJ has over other martial arts.  There are many more on sites like Youtube.com and google videos.