Here goes.
Fling does NOT do HP fills. They will fill to 3000 and thats it. They also provide AL 80s, so no need to bring your own tank, unless you have a special need to. If you take a DIN tank, best advised to bring a DIN adapter to assist in the filling process.
Like AWAP said, March trips can be tricky. We had one Feb trip cancel, but the next one was a go. Still the waves were 5 foot with 7 - 8 foot swells. Of course, on Sunday, seas were at 2 - 3 foot. Needless to say, re-boarding the boat is a practiced art.
Water temp was 65 while we were out. I dove dry and my buddy dove a 6.5 mil two piece. Both of us were comfortable, but I was the one not shivering back on board the boat.
I'm tenatively scheduled to go again in March, but we don't have a firm date set yet.