He is a great designer, but very unorganized, unprofessional and can't follow guidelines and requirements.
If you just need the output/compiled/rendered files, he is good. but if you need source files, you have to be as expert as him to understand his source file and use it.
Besides, communication is not good as well, He agreed on something but after contract started he tried to divert things in different way.
so, it's not that he does not worth your project, but just be sure and clear enough with him in private message (aka chat) before making final decision.
best of luck