Weighing 20 kg, Thermaltake has obviously taken an uncompromising approach to thickness and material mix with the extremely sturdy metal frame and thick glass and exterior aluminium panels. That in itself demands a premium in general, but the materials alone do not justify the $300 price tag. True to the phrase "it's what's inside that counts", Thermaltake also delivers on the internal feature set with loads of space for even the most expansive liquid-cooling setups. In fact, that is clearly the focus of the A700 TG. However, if you opt to utilize the case for an air-cooled system, there is simply no cooler big enough to make the A700 TG break a sweat.
Naturally, due to the sheer size of the case, you expect to be able to stuff it full of hard drives as well, and the A700 TG allows for up to six 3.5" drives or eleven 2.5" units. While some full-tower enclosures offer more 3.5" storage space, the A700 TG provides enough for all but the most extreme scenarios. On top of that, Thermaltake manages to add a bit of its own DNA by offering the ability to rotate the expansion slots from the traditional horizontal to an all-vertical setup. At this price, including a PCIe ribbon cable would have been nice just to make that $300 dollar purchase a little lighter, but I know I am asking a bit much here.
Let me conclude with the thing that is probably apparent: you need to be sure you can use a case to some extend regardless of price. However, when you plan to spend $300, you are most likely in need of features that come with planning your own extreme liquid cooling setup. To have the choice to put a system together in such a beautiful chassis with aluminium panels is great, and you get plenty for the money.