I don't know about other people, but I wouldn't buy it.
However, there is a member on this forum that has an ebay store and he sells some customs. He actually knows what he's doing and talking about, unlike others.
Take your link for example: he says it's 6.8 ghz. It's not. Just because there are 2 cores running 3.4 ghz doesn't mean your speed doubles.
I've never heard of SuperTalent, so who knows how good the memory is.
The motherboard is about $40 on NewEgg, so I don't think it's that great. Plus it doesn't seem too "Upgrade Friendly" for possible future upgrades.
Long story short: do it yourself because you know what parts your actually paying for.