I bought the EZ straps when I was in Florida. I actually had to buy two sizes because of different boots. But they work very well, the one thing you have to be careful of is that they fit your fins correctly. They have two attachment methods, one is a plastic snap similar to a normal fin strap, the other is a couple of pins that fit into the holes on some models of fins. Switching between the sizes is the work of a few seconds.
The problem is that the posts on fins isn't standard, they varry all over the place. On my IST fins, the posts are actually just a tad small, and occassionally I'll get one to slip off if I pull on it wrong. My wife's Mares Bolos can't be used at all unless I modify the posts or the hook, the posts are two big to fit.
Oh, one advantage of the EZ straps is that you can kick the strap loose. For me I have some restrictions in how much I can move my leg and its sometimes easier to kick the strap off, and then just tug the fin off. Of course only done in shore diving.
A few of us have them and love them. For the most part we were too lazy to make our own more than anything. The ability to have different sizes was also nice to accomidate for different dive boots.
