I have 3 level 50 Agents, so there you go.
I've only played half the class stories all the way through so far, but the Agent is by far my favorite. There are those out there that aren't fond of it, but I can only say that if you want to be a celebrated hero type, or a very powerful villain, or be a fun, quirky character the Agent is neither of those. It's not a glamorous job and you never quite get the respect you deserve.
Most of the writing credit for the Agent goes to Alexander Freed, who is now a freelance writer, and he has also written the comic series Star Wars: The Old Republic, The Lost Suns
and Star Wars: The Old Republic, Blood of the Empire
, and Star Wars: Purge: The Tyrant's Fist