for the first 15 hours or so pre/post flight briefings are vital. where i was a student they had private briefing rooms where we went through what we were going to do, sorted out the planned r/t etc beforehand. about 15 mins pre and the same post, with a reminder of what was coming next time, and advice on what to read up on.
after i went solo, the briefings were not so thorough, and the FI would often ring me the day before to tell me what to plan for, and i would get everything ready for him to jump in at the last minute, and it was only when we moved onto a new topic that we would do a formal brief.
i changed schools at 10 hours, not because i was unhappy, but the original airfield was not licenced in the evenings, and i wanted to take advantage of weekday evening flying. before i changed i went for a lesson at the new school to make sure i was happy there. there was no problem changing from the old school.
you are paying a lot for a service, make sure you get what you pay for.
good luck.