I'm a casual player, I only get to play a 1-2 hours during the week, and about 4 hours on the weekend.
Loving the leveling in the game so far, with the little amount of time I have to play the game, it's a lot more enjoyable than other MMOs I have played. Luckily, I am on a High populated service, so I have had no issues finding groups to do heroics or flashpoints.
Great game so far, I am really looking forward to what Bioware will roll out in the future!