I have just got rid of a 2008 Tribeca Ltd. I had an awful time with a jerking transmission when at highway speeds when climbing a slight incline or passing another vehicle....ie., when accelerating slightly. This went on non-stop for three years and Subaru could never correct it in spite of two torque converter replacements. I got tired of visiting the dealer for this problem, over the three years that I had the car. The dealer agreed there was a problem and wanted me to keep up my pressure on Subaru Canada. Subaru Canada, however refused to acknowledge that there was a problem, and closed the case on me as my 3yr warranty expired.
There are reports of other Tribecas having this problem. My dealer here says he has seen two other cases.
I would not TOUCH a Tribeca based on my experiences, and sadly my experience with Subaru in general has been coloured by this experience. This is/was my last Subaru.