I personally wouldn't trust my well being to a knife that was questionable. I'm not saying to blacklist any knife under $15, but I do think in a lot of cases you get what you pay for.
Save up and get a more favorable model from a reputable maker. $35-$50 seems to get you in the door with quite a few nice reliable models - Kershaw, Spyderco and Buck all come to mind in this category.
Murphys Law - the knife will fail when you need it most.
"I'm normally not a praying man, but if you're up there, please save me Superman" - Homer Simpson