I've used a frost, both their regular line and their Metal Warrior line. The Metal Warriors are alright, they're a step below Rough Riders in my opinion but it worked ok, got sharp, held its edge well enough. Their regular stuff in 420j though, yick.
My biggest issue with the cheapest of brands like Frost, ect. is that they just cannot get sharp without a ton of work, yet lose their edge immediately. The super soft steel just burrs and burrs, only if I sharpen it in a certain way will it take any sort of sharp edge. I like sharp knives.
Rough Rider knives aren't that bad at all though, certainly worth their price. The steel/HT they use is almost on par with cheaper American knives and even some good companies like Case, but not as good as Buck's 420HC. The grinds and finish won't be as good as Case for the most part, and most RRs aren't nearly as good as a nice carbon steel blade. The one exception to this is their San Mai knives, but it seems that was only a short run.