I think you should read up on what youíre interested in and have an idea of whatís available on each ship. I would never just go off what a TA tells me. I called Carnival three times and then the TA to book. Like I said the only perk was the OBC and thatís real sweet. As far as price change the TA told me that my job to check and see if the price drops and if it does call her and she would take care of it. As far as the TA itís one that I know people here on the board recommended and use.
It may be worth it if something comes up and I need her to help fix a problem. I would have no problem going directly through the cruise line again to book.