If you really want him then go and try your luck but have no regrets after doing that and not getting what you wanted to get, of course getting the 40 frags you need .. But in my experience, i spent some couple of hundreds of cps on the Konoha Great Tree last cycle to get my last 20 frags of him and i feel disappointed after getting and trying him .. I can say that go and get him if you have the appropriate ninjas to team up with him, Shisui to be exact or Danzo but if you don't have any ninjas like them then you must reconsider things ..