Edmodo Snapshot

Anyone played around with this new feature? It looks fantastic, but I'm curious to know if anyone has actually used it within their classroom. It seems to have everything figured out - really great practice for PARCC - but I don't know if the reading passages are grade-level appropriate or even content appropriate, so how do you know what the students are going to be tested on before you assign it? Again, it seems like some really advance technology and it could be great practice; I am just wondering if anyone has more experience with it before I start messing around trying to figure it out myself.