This'll sound weird, but I use my retired Birkenstocks.
Advantages:
1. They're free. I'd have thrown them out.
2. Slip on and off easily.
Disadvantages:
1. I imagine they'd be slippery on a boat deck. By the time I retire them, the sole is flat. But when I'm boat diving I either am already half-dressed in a suit (including boots) or barefoot (in the tropics, where boats tend to insist on dropping shoes).
2. With heavy drysuit socks on, they're a little tight. (But I usually only but the dry suit socks on immediately before putting on the suit, so it's not a big deal.
3. The salt water finishes them off pretty quickly. Even so, I live in Birks most of the year, so I usually wear out a pair in time to replace the ones I use diving.
4. In the coldest and wettest weather, I'm wearing boots. There isn't a perfect shoe in that situation.
Advantages:
1. They're free. I'd have thrown them out.
2. Slip on and off easily.
Disadvantages:
1. I imagine they'd be slippery on a boat deck. By the time I retire them, the sole is flat. But when I'm boat diving I either am already half-dressed in a suit (including boots) or barefoot (in the tropics, where boats tend to insist on dropping shoes).
2. With heavy drysuit socks on, they're a little tight. (But I usually only but the dry suit socks on immediately before putting on the suit, so it's not a big deal.
3. The salt water finishes them off pretty quickly. Even so, I live in Birks most of the year, so I usually wear out a pair in time to replace the ones I use diving.
4. In the coldest and wettest weather, I'm wearing boots. There isn't a perfect shoe in that situation.