Nice job! I also eventually got him for free as well. After that, I did a bit of work and four starred him. All I can say is that you should five star him. He is worth it and does a lot of damage at four stars, and that says a lot since he does an insane amount of damage as a tank at three stars. The biggest thing, however, is he also gets tankier as you upgrade his star level. So yes, I recommend five staring him as soon as you can.