I know you've bought the duovids, but I'll throw in my .02 anyway for anybody else that might be thinking about buying these 3.
I've owned all 3.
There is no doubt that the optics on teh EDG series are spectacular. They offer a beautiful view from edge to edge. I carried these around in the 8x32 variety for a season doing the kind of hunting I do - steep, rough, hard, demanding stuff. At the end of the season, the EDG binos looked like they'd been dragged behind my truck for a few hours. They were chipped all over the place and looked horrible. The front hinge cap was missing. The enamel covering the hinge was beat to hell. Granted, I hunt hard, but I'd never had a set of optics look like this. I sent them back, they sent me a new pair, and I sold them.
The Duovids I owned were great. They were the 8+12 variety. They felt like they were built like a brick and if I wanted to, for some reason, I felt I *could* drag them behind my truck without any damage. My problem with the duovids was the weight. They came in at 36 oz - and that's quite a bit to hold around your neck when you do a lot of vertical hiking. That extra 4X of magnification costs you about a pound.
The binos I use most often these days are Swarovision 8x32s. I also have the swarovski rangefinder binos, but I only use those when I need yardages when hunting. I LOVE the little 8x32 swarovision binos. They offer the perfect blend for me - enough magnification, plenty of light, very light weight and my favorite view out of any bino. Plus they are so dang ergonomic - it's so easy to use this little swaros. I'm in love.
Granted, I'm not comparing the duovids to a 8x42 swaro, but the same thing applies. I also should mention that I didn't end up using the 12x nearly as much as I thought I would when packing the duovids. As others have mentioned, 12x is tough to hold still when hiking unless you have a pretty good rest, and more often than not I didn't. I also find that when I'm scouting or need more X's, I usually have a spotter of some ilk in my pack.