It does its job quite well,
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This review is from: Op/Tech Rainsleeve - Twin Pack (Electronics)
I give it four stars because despite being a good product I found that it's quite difficult to attach it on your own. I had the opportunity to try it out during a snowy day earlier this year and had it not been that my wife was with me, I wouldn't had been able to put the rainsleeve on. We were already outside and it began snowing. Of course you can put it on your own before going out but if you don't do that and go outside and the rain or snow catches you by surprise, you will most likely struggle to get this on your camera.
My camera is small. It's a Sony a33 (equivalent of a Nikon D3100) and so once the rainsleeve is on there will be quite a lot of 'unused' space because this cover is big.
However, it did protect my camera and lens from getting wet and I ended up taking some worthy shots in the snow that I wouldn't had been able to get had I not had this protective Rainsleeve.
So, if you have a smallish camera, you will probably struggle and fiddle quite a bit with it even when it's on BUT it will protect your gear.