I have the YSD2Js. Sea & Sea replaced my original set for the Js after they failed and I don't think I'm fairing any better. They seem to work for me for a handful of dives then just stop firing the rest of the trip. On my most recent trip to the Philippines 1 lasted 5 dives (I was shooting macro with only 1) and when I went to swap it out for my other one I couldn't get it to fire at all. I'm personally not very happy with the YSD2Js. They're not very reliable. I've had issues on every trip I've taken them on that I've done more than about 5 dives on.