I
absolutely love my personal trainer. I was really apprehensive about working out with one (I was 250 pounds), but thought that if I really wanted to do it right this time, I needed help. So, I sucked it up and signed up. My first trainer left something to be desired (so don't feel that you have to stay with the same trainer if you aren't "meshing"), but now I work out with a great guy who is extra fit and was a body builder, but he also motivates me and is super nice - not arrogant, like he's God's gift.
If you get a discount on training sessions, I would highly recommend it. My trainer makes me do exercises that I need to do, rather than me working on my own and doing exercises I don't mind doing. My trainer has worked with me for 6 months and I've lost almost 50 pounds with him and over 25 inches. (He helps with the exercise but also my nutrition).
I just say to find a trainer that works best for you - make sure that they are on the same page as you are as far as your goals.
Good luck, and if you have any questions about PT in the future, let me know!