Arenacarry is %100 legit. I opted to play my own character to my desired rating. This is naturally a more expensive option, and I would only reccomend if you know your class and don't mind taking some constructive criticism. They were patient with me and made sure I was able to achieve my rating. They seemed to take great lengths to protect the security of the accounts they were piloting, so I would feel comfortable letting them play my own.
Arenacarry was in constant contact during the entire process and were upfront about all costs. There were no suprises.
Would reccomend.