Played it when it was still new. Payed the absurd fees to unlock content. Wasn't impressed by the cost for the addition of a minor storyline or marginal gear boost. Stopped paying. I was locked out of most of the content I had already paid to access and allowed to keep only those items that wouldn't improve my overall progress.
Free classes are almost useless against paid ones, so make sure to start a new character if you are naive enough to invest. The money doesn't get reinvested into the game. Updates are mostly placing existing characters into new layouts of the same environment.