Is General Grievous worth it

My grevious is 5* g8 and i also have all other droids maxed 7* g8+. Grevious is sweet. I can make a droid team with daka/poogle/poe in mix for any situation. GG hits almost as hard as 86/88 and cant be evaded or countered...have him hit duku 1st then follow up with 86's special...dead. no counter. Grevious's laugh at my 5* g8 works in arena on omega toons. And the laugh seems to make them take increased dmg in addition to lowering there hp (please more input here anyone else notice this?) Bottom line grevious reg atk does crazy dmg at 5* cant wait till he is maxed. And his aoe is group healing immunity...put that in your bacta tank and smoke it...oh wait you cant because you cant heal!