Can't offer any personal comments regarding Trax Air, but if you are still looking at other flight schools for consideration, I can recommend Sun State Aviation based at KSIM and Tailwheels etc. based at KLAL
When in Florida I rent 172s from both operations, well maintained aircraft and good instructors, I did my FAA PPL with Tailwheels, could not fault their operation, also both companies do a lot with overseas students.