Crowley claimed the grade Ippissimus in his system. There is debate about whether he attained to that or not, it is the highest state of consciousness. However, many people do not care.
I can say he knew what he was talking baout and he was serious about his practice. The system he laid down is workeable, largely free from dogma, and is designed to be rigorous and to attain results.
I think he was certainly one of the biggest contributors to the occult world and a very accomplished magician in his own right.
He went through three (I think, definitly two) inheritances spending it on what he termed 'the great work', and published all his own books with the best quality materials so they would survive.
In his system the title magi is not used, the title magus is used. In my opinion he definitely got there, but for ipissimus, I cannot comment and do not have the knowledge to comment on that matter.