Interesting thread. I would love to try out some spring straps, but I'm not going to spend $40 or $50 to find out that they aren't any better than my rubber straps. I have never had my straps break, but then I don't have 2000 dives. I have had a Jetfin strap buckle break and I was not a happy camper when it did. I was at Haunauma Bay in Hawaii and had to rent crappy full foot fins.
I have used my EMT shears to cut fishing line. The guy at BHB that hooked me was not happy either, but then, he hooked me on purpose so, I wasn't very happy with him.
I think the Air II was a great invention, you may not agree, but I love mine. Slap Straps are wonderful, I need to get another, but I want one like Baby Duck's. Where can I get one of those? (It has "Stroke" printed on it.)
I don't like back inflation BCs. They trap air. I like my SP Classic Sport vest style BC. Especially the newer versions with four places to dump air.