Great addition to my camera
Crutchfield Customer Review (What's this?)
The VF-4 greatly improves my outdoor framing and focus capability, because it is free of glare. It is compatible with my eyeglasses, too. And the ability to tip it up comes in handy for certain shots. It's an expensive accessory but offers a lot to make up for the cost.
Pros: No glare, compatible with eyeglasses, better focus and control of depth of field, tipping ability.
Cons: Adds to camera bulk and is more fragile than a built-in viewfinder.