The Wichard knive does not flick open, nor do I want to.
I use the Marlin spike regularly to break knots that have seized. The shackle key is invaluable.
I wear the pock-it pouch on my pfd, which I always wear. The knive is on a lanyard attached to the pfd. I have a wrist strap on the mag lite.
I am often tethered; a knife is mandatory.
Ahhhh I get it. I always wondered why they would have a marlinspike on an "ermergency knife". I guess I was thinking it was for splicing, and I couldn't imagine needing to splice something STAT. That's what knots are for.
Here is what I want in a knife, in order:
1: Must be able to be easily carried and EASILY opened with a cold wet half-frozen hand.
2: Must be able to cut through rope quicly and easily.
3: Should thrive on abuse. Especially repeated salt water immersions without rinsing. (I don't baby my tools)
4: Shouldn't be easy to cut oneself with wet slippery hands when using the knife.
5: Shouldn't cost too much.
6: A shackle key would be a plus.
I'm thinking that if they meet #2 Jackdale's Wichard or the Spiderco Rescue might fit the bill nicely. Though the Spiderco does better in the "what word would I say when I drop it overboard" contest than the Wichard.