Xwing comparisons aside, it is good to hear that people are having some success with the generic starvipers. while they may be overcosted, as we all know, mathwing cannot tell us everything, and the manuverabilty of a vessel counts for a lot. So, is it possible that a ship can be overcosted but still pull it's weight? I think sometimes that can be the case.
See also, tie defender. another ship that is likely overcosted, but anytime I play one it performs well, tears up lots of stuff, and goes down hard.
I think some people don't give enough credit to the dial or certain maneuver. Also, we're all different, you might be looking for something else in a dial than me.
Even if I had some success with it, I do believe that the Generic Starviper is slightly overcost. I'll need to continue to make some test drive with it, but I don't think you can just take a Starviper and expect it to deliver for his value. You need to work for it. Things can still go wrong pretty fast and you just lost 25+ points without even having a chance to shoot with it. So plan your next move correctly.
But this dial! Having all the 1 move green or white on a small base ship is incredible! Can't tell you how many times I wished that I could pull a straight or bank 1 in a Interceptor; People used to flying those craft know what I mean. Add to that Barrel Roll and Boost. Starvipers love fighting in an asteroid field, they're in their element! Use it to your advantage. And the Segnor Loop, it makes it so unpredictable. The enemy can't really block you, if he tries to and he guessed wrong, you're probably now right behind him. Next turn you can tail him by doing a smooth green move and realign with boost as needed. The lack of Hard 3 hurt it a little, but once you get use to it, the rest of the dial more than makes up for it.
So that's pretty much the thing with the Starviper. It does cost a lot, I can't deny it. But its dial is unique, it can pull some maneuver that no other craft can do. The only question you have to ask yourself is: Is this dial worth it for you? For me at least, it is. It is exactly what I am looking for in a ship: Lot of options.