Thank you for the replies. I was looking at the PvE aspect, sorry that I wasn't more specific, but thank you for the responses based on PvE content. Your replies were very helpful and I believe that I will play a little more until I decide which spec I would like to go once I hit end game. Once again, thanks for your replies.

So I've decided to level up a trooper first and, after playing a powertech bounty hunter, I found that I did not enjoy the tanking advanced class. Now playing a commando I am torn between playing a DPS or a healer. I do not have any vast previous experience playing a DPS or a healer but I am very interested to try playing one of them. (Please note that I did do a small amount of raiding when I played WoW, as a tank, so I do understand the mechanics of each role but have never played a DPS or Healer.) If some experienced players, or just players with a decent opinion, could give me possible pros and cons to being a commando DPS or healer it would be very much appreciated. Thank you.