Just two and its standard webbing. I agree that there seems to be no problems with this.
-Non-standard: team has to carry multiple spares
You carry extra BPs&Wings on a dive? Wow. I have never seen this. That being said, any bladder and any webbing will work on it.
-Seems to require an awful lot of fiddling/pushing with a screwdriver just to get the thing assembled.
It's actually pretty simple. Threads almost the same as a BP and there is no need to micro-adjust it between individuals.
-Plastic screws to link wing to plate
I have SS in mine. However, I did not know that this is non-DIR.
-From the pictures it's hard to tell how much elasticization of the wing there is. The Deluxe ET clearly has some, but the plastic-clipped bungee running to the outer, bottom, inside corner may be a problem as well--or may not.
Nothing like the BWOD. The bungees are a part of the system, though not an essential part.
-I don't see a reasonable wing for small doubles on Zeagle's website ("optional bladders"). By reasonable I mean a non-bungeed, non-funny-shaped, non-dual-bladder horseshoe or donut wing.
You can put any standard wing on it, but I don't see it as a solution for doubles unless you are forcing it to work.
Can be replaced at some price in time/effort:
-No crotch strap by default
-Long oral inflate hose
-Seems to come with velcro oral inflate hose retainer by default
-Plastic D-rings, triglides, and harness buckle
Completely agreed. The plastic screws should be in this list.
-And finally, if you're going to dive something 90% like a BP/W, why not just dive a BP/W?
Is this a rhetorical question, or did you really want an answer? I have abandoned the BP&Wing for singles diving in favor of this rig. It can be swapped between team members mid dive without any need for adjustments. While, I have never seen a need for that, getting out of the rig is significantly easier than any BP&Wing because of it. This is huge for those of us with joint issues. You can set up D-rings and other gear in DIR fashion easily.
N.B. I would be more than happy to dive with anyone diving an ET, and I think it's a perfectly reasonable gear choice.
You're always welcome to come dive with me in Key Largo. I love showing off my back yard and show how we are actively restoring the Keys.