I'm not going to lie, in general I have had good luck with cheap scopes too and I have one of those Tasco Bucksights and have had pretty good luck with it. I did have a buddy that had one of those fail and he now uses one of the T/C scopes. Really, anything can fail though and I've had more Leupolds fail than anything else.
However, in general I do tend to spend more on optics and I do like quality optics. Many times it's not that I've had such better luck with them, but I put more faith in some of the more expensive ones than I do with super cheap ones. I just always have a fear of the cheap ones breaking even though I've only actually had one fail and it failed right away.
That said, I can't say much bad about the Tasco Bucksight for the price, and like I said mine has been good to me. I have 3 friends that claim they have had issues with them, but one of them it seemed to be the gun imo, one may have actually had an issue, and another just started missing deer with it which is unusual for him. He never shot it at paper again to see what it was doing, and he just replaced it. So I'm not sure if they really were all bad or they just assumed it was the scope first thing since they were cheap. I have several other friends that use them and most of them have had great luck. It's surprising to me how such a cheap scope can work as well as it has.
It's also very comparable to my Leupold VX-I's I've used glass wise. Really in everything except for I've had 2 VX-I's fail, and no Tasco's.
That said, once you step up to a Burris FFII or similar, you realize what you are missing glass wise, and it's hard to go back.