I'll be honest, I went ham on the tree up to lvl 5 just so I Could get clothes. At lvl 4 I got a lot of minato frags which was nice so im near 4 star and now im on lvl 5 and getting a LOT of keys, atk magatama and coins. No kakazu frags in like 50 pulls in lvl 5 so meh. If you don't need anything off the tree I wouldn't do it. If you do tho you can get some decent power and possibly some good initiative from runestones (as we all know init is what this game is about now.)