I'll chime in since I have used the Monoprice cables a number of times. Generally speaking their cables and interconnects are of very good quality and build. Unbelievable for the price really. But when you break it down, what it costs Blue Jeans to build a 3' interconnect, the profit margins are pretty large so it is easy to see how Monoprice can be priced so low and still have a similar product.

I have compared them directly with Blue Jeans cable and Monster and think they are all about the same with some differences (not in sound though, only build). Monoprice uses RG-59 and RG-6 for all interconnects, just like Belden (used by Blue Jeans). Monoprice cables seem to be very stiff, which makes them hard to work with in some cases, but not excessively so. Monster cables are always nice and supple which is nice. Blue Jeans Canare connectors are a bit nicer than what is used on the monoprice. The monoprice (premium cables only) still use a nice connector though, its just not Canare quality. In all cases I have heard no difference between any of these cables (on my modest mid-fi equipment anyhow, Onkyo, Marantz, Monitor Audio etc.).

Monoprice HDMI cables are the same as the lower priced Blue Jeans cables, and priced similarly. I do not see why you would need anything more when they are selling HDMI v1.3a Catergory 2 certified cables. I would only buy the more expensive Blue Jeans if I needed a really long cable 50', because the cheaper ones are only certified to 35-40' I think.

Just my 2 cents. If you have a mid priced system, I think monoprice is a great way to go, and definitely sounds no different than Blue Jeans or Monster. If you have a high end setup, I would at least try something nicer for comparisons sake. If you need eye candy, then monoprice is not that either.