The Viper's strength is in it's outright speed and ability to accelerate in any direction quicker than anything else. It is not a fighter that you want use in a turning battle, plenty of other ships outclass it in that regard, including the Cobra. However, it'll punch in and out of trouble and give you the ability to dictate range in a way no other ship can. That's the difference between staying alive or being boiled if you've bitten off more than you can chew. It's also has a very small profile, far smaller than a Cobra which makes it harder to hit.
It's weaknesses are FSD range and fuel usage (you pretty much must have a scoop).
It's weaknesses are FSD range and fuel usage (you pretty much must have a scoop).