Just bought the FJ Pro SL BOA model. Tried every BOA shoe in stock at the store I was at. The FJ model stuck out b/c of the location of the BOA mechanism. The shoe seemed to pull more evenly when the mechanism is placed in the heel. Didn't like the feel of other models mounted on tongue. They are very comfortable and secure.
1. I had a tendency to over-tighten my first few rounds. Relaxed the tension at the turn and felt great. Still secure
2. The heel on the Pro SL has a pointed shape that come to the base of my large ankle bone. Gave myself a hearty blister on the range with shorty socks. 4 rounds in, slightly longer socks...problem solved.
Overall, I'm really happy with the Pro SL BOA model. Waterproofing is excellent. Great grip, secure feeling.