Two weeks ago I was out on some sand dunes taking pictures of my family riding 4 wheelers and noticed I couldn't see the lcd on my G3 at all. So when I got home I started looking at film slr cameras because I wanted a good viewfinder. Instead I bought the hoodman h-dcr lcd viewfinder and recieved it today.
It is made of soft rubber with a plastic 2x magnifier. It collapses down so it's more compact when you don't need to use it. Bad part about the design is that the rubber isn't very sturdy. When you press your eye against it it will move, so doesn't help as much as it should for getting less shaky images. Also, the sides are a tight fit for the g3's screen, and if the sides are bent in you won't be able to fully see some of the settings.
It comes with a strap to connect it to your camera that can either be set horizantally or vertically. I'm guessing it's 2mm thick, plus the notches. You can cut the extra cord off. Even a small string keeps the swivel screen from folding back into the G3, and this doesn't even come close. It barely closes enough to make the screen flip back from self portrait (mirrored) mode. I haven't tried velcro yet.
Ok the view inside it. Yes, you can see the pixels, but they're not huge. It completely blocks out other light (I didn't even notice my flash going off). It's sharp enough to judge manual focus accuratly and use a polarizer.
If you want one, get it where I got it: http://stores.ebay.com/Ipkus-Imaging for $20 w/ free shipping. Alternatives are the digifinder and extend-a-view. I just got this today, so I'll post again after I put it to real use. Ask if you want to know something about it.