Pro’s: You can catalog your work online and get feedback from amateur poets(though typically not much). You can find some good poetry there, but you have to look hard for it. There is a classic section that posts work from famous poets.
Cons: Computerized ranking system that uses an algorithm to rate a poem’s quality, rigged contests, bullying, extremely poor feedback, complaints aren’t answered in a timely manner(and they’re usually brushed off), rampant plagiarism.
If you are serious about the craft of poetry, don’t waste your time or money on this poor excuse for a poetry site.