RE: 150 meter rule.
I totally agree with all the comments above. I just got back from practicing at the field shown in the last picture above, and I can say my own habit had been to fly well past 200 yards and bringing it in to 150 was horrible. Basically it requires learning a whole new speed and size for all the maneuvers. It wasn't quite as dramatic as I envisioned, but more difficult for sure.
Joe