Monoprice is perfect for "good enough" cables. Would not recommend for "zOMG" important, but anything other than that... Cheap, and work 99.9% of time.
Yeah, important caveat there.
Monoprice is great, because they charge you only a 200% markup on those cables that come from China, rather than a 2000% markup, like some name-brand brick and mortar chain store might for the exact same cable in a four color glossy printed blister pack.
Not where I'd go for cabling that supports some sort of high demand commercial infrastructure. But they're perfectly adequate for most any individual residential application you'd care to think of.