I have to say I think I've really lucked out with trainers, both of my steady trainers have been really great at changing things up on me so I stay interested and motivated. We only focus on strength training since I can easily cover cardio on my own.

They know my fitness goals and then I give them carte blanche to do whatever works towards meeting them.

I think I would totally ask around the gym if anyone else has a trainer they really like, I had some trouble with the first guy I got assigned to and ended up dropping him. The second trainer I knew on a personal basis and when she moved she referred me to the guy I use now.

I'd probably use each of the remaining 4 sessions to "try on" different trainers and see if any of them are a good fit.