As of this moment, only my free keys is what i used .. The drop of ninja fragments seems good makes me sad a little bit for spending too much to complete Kakashi [Anbu] in last event Konoha Great Tree .. But what's done is done and nothing to regret since it is not a waste that i got .. By what i read above from you guys, it seems like Great Plates is really good to spend, since the loots Mood Scrolls and Seal Scrolls are great .. Actually, from my 20 free keys yesterday, i already got 20 frags of Guy [Gate of Joy] and that's free .. So, i'm looking forward in the last day of the event where i'm gonna use all my resources (wait, maybe not all, but i will put a limit again) and see what can i get :D ..

Update (04.13 09:30PM) : As of this moment, i already used 110 keys, both free and bought from shop (60free/50paid) .. I managed to complete and recruit Guy[Gate of Joy] from scratch, got 20 Kakashi[Anbu] fragments and 8 Kisame Fusion Mode fragments .. More or less 20 Mood Scrolls, More than 10 Purification Runes, 4 Seal Scrolls and the rest are Coins and Medium Refines ..

I agree too .. Earlier this afternoon, i used 10 free keys and i got wow .. 2 seal scrolls, 4 mood scrolls, 1 10*kakashi[Anbu] fragments and 3 50k*coins .. that's worth 250cps+ of free stuffs ..