It'll probably be fine for day to day use as long as you don't abuse it. Think of them as tools. A 300 piece set of Husky's for $60 is probably good enough for most people who don't want to spend thousands on a set of snap on's.

But if I were in a situation that depended on me having reliable lighting, I'd probably stick to my novatac or surefire lights. The build quality, reliability, and interface is probably going to be on the low side with most lights from DX. Then again, no one's ever died from eating mcdonalds either.