Definatley worth it - maybe think in terms of time rather than money?

25 BH comms is roughtly equivilant to one EC SM Op - 2-3 hours

or

4 x Weekly Corellia missions e.g. 45mins (inc travel and getting 4man!) x 4 weeks.

or

5 x Daily HM Flashpoint Missions 15mins - 1hour depending on FP and group. Lets say 5 x 30mins on average.

So as you can see depending on what type of player you are the free gift is worth 2 1/2 - 3 hours of game time. So in my opinion well worth it!