Firstly if OAT has fired the instructor I am thinking it might be then big big mistake. He was really excellent and always ready to provide extra assistance. He got my class through the RNAV internal exams and JAR's with some great instruction and helpful pointers.
As for OAT ground instructors - there are some really good guys there and in my class of 20 only one person returned home from the States to retake an exam. Only those having been through the school are able to comment on its quality....and I wouldn't hesitate in recommending the school to anyone looking for a groundschool. I never heard of anyone going to Bristol for brushups!!! Pedro - there wasn't enough time between SF's and JAR's for that....!