I'm currently doing my PPL with harvard, and only have positive things to say about them! With it being the 1st FTO i have attended for a course I cant really give a comparison to other schools.
For me cubair was too expensive, but then if money is no problem flying the katana is fantastic!! Redair seemed good also, but i found harvard to be more professional ( also had a friend at harvard).
As for availability it tends to be very good, as long as you book a few days before you sure to get a slot. Only thing i would say is that if you prefer having the same instructor all the way some work part time so you may have to choose the week or weekend to fly.
Fleet is well maintained, 3 c152's 1 c172 and pa-28 available on request. I have found the club to be very friendly, and i have no complaints about the airfield. As for the comment about being waterlogged before, we use 07-25 as a runway ( is usually a concrete taxiway) if this is the case.
Be sure to PM me if you have anything else to ask!
M1995.