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I instruct there & can confirm class size can vary from as few as 2 or 3 to as many as 12-14, it simple depends on the number of folks that are scheduled. When the class size gets over 14, they usually start a second class for they feel anything larger gets too big.
I went to a type school where there were only 3 folks in class (it was HPA) & I've seen class sizes that were in the 12-14 range at HPA, the quality of instruction doesn't so much depend on class size as it does in my opinion of the quality of instructor.
I will say the primary instructor (Carson) as well as the other primary instructors (Lynn, Bob, & others) do a great job of keeping the program flowing & provide great instruction regardless of the class size. Now if they go to the "B" team instructors like me, then ask for your money back but with the A team guys, you won't go wrong.
Most schools you pay your money, do the time, get your type, & everything about the 2 weeks becomes history. The best part of HPA is that for the two weeks & money you invest with them, your return will last as long as you wish for it too. Mark, Joe & everyone provide a network of aviation contacts that in my opinion (I'm biased obviously) is unmatched by any other type school. If you're in DAL sometime, near DFW, please call them & they 'll be glad to give you a tour, if you end on a Wed or Thurs, you'll get fed at the Arlington baseball field too, a tradition where Mark takes out every student for lunch each week to TGIFridays & gives them a great tour of the stadium (Mark loves baseball).
Hope that helps,