Well, I've been using Tascos for 35 years, and I've never had any issues with any of them. No, the optics aren't as good as high-priced scopes(especially in low light), but for most people, under most conditions, they work just fine.
This is commonly a problem with "cheap" scopes that arent built well, they literally come apart when use on rifles with stout recoil.
Its fairly low magnification.....therefore the cheap optics should be an issue, or near the issue they can be at higher magnifications, ie yellow colored, foggy optics.
I've used them on every type of rifle I own, including some fairly "high recoiling" guns. No problems. None. Nadda. And I have a 6-24x Tasco mounted on a sporterized 8mm Mauser right now (got the scope on sale for $89). and its been doing just fine.
As far as edge distortion, I've never noticed it--since I use the center to aim, don't see it as an issue. FOV doesn't seem to be any different either.
The only thing I've noticed with the cheaper scopes, is that they are more critical to eye relief, e.g. there's less of a "sweet spot", and you may have to adjust for it (by careful mounting).
I'm comparing my 6-24x to my buddies Zeiss, I really don't see a HUGE difference in
utility. There is a difference, for sure, but then again his scope cost 10 times what mine did. His is the only really high-end scope I've shot extensively, although I've shot many for a few rounds.