I've never been a fan of leg vises. I've used them on benches I've built and others and have always wondered "where is the beef". I've found them fiddly and with holding power no greater than a good English metal QR vise.
That has changed. On the traveling bench I've installed a leg vise using a Lake Erie Toolworks wood screw and all I can say is "forgive me father for I have beared false witness".
That sucker is fast and clamps whatever you put in the vise and without going all Conan it holds with no movement no matter how hard you press. While I like my metal QR vise, I think I'm in love with the new leg vise on the travel bench. So much so I've eyed the main bench to see if I could retrofit a leg vise with a wood screw. Sad to say no joy but what the hey it might give me an excuse to build a new main bench.