Ok, just checked your links. The fact they're not mentioning motherboard, psu, Ram brand or ram stick sizes would make me steer clear, unless you're happy to spend another few hundred to replace them. Prebuilds like this* are the reason people think PC's are buggy and unstable, they know people only look at cpu, gpu and amount of ram so make sure it's big numbers for ram and a decent CPU, GPU combo.
Also be prepared to find all your ram slots filled, and little/no room for future upgrades. Best bet is assemble yourself or buy parts and ask a local PC repair shop to assemble for you. Still be cheaper and you will guaranteed quality.
If you do decide to buy your own parts then post your items on Toms Hardware or somewhere and people will let you know if it's a good build and if it's all compatible.
*prebuilds that tell you all the specs are the way to go if you know the best brands and what you need, but you pay extra because they can't cut corners.