With a chassis like the Nanoxia Deep Silence 2, there are a lot of things to consider. This chassis does offer you silence in its operation, it is super simple to work with, it offers a good feature set, offers water cooling options, and it looks very basic on the exterior. There aren't any windows or side panel fans, but that would defeat the purpose of having a silent chassis in the first place. With all the sound dampening materials on the inside of both side panels, inside of the front bezel, and in the roof of the chassis, any messing around with these pieces will only end up with a louder chassis, even if you don't add another fan and are just wanting to remove the top panels for passive ventilation.
Of course people who tend to buy a chassis for its silent capabilities aren't willing to mess with a good thing. Once you get used to the very limited noise levels of this chassis, you won't want to change anything and screw that up. The only time I even got a more normal noise level out of the chassis was when I was adjusting the fan controllers, and even here it was because the front panel was open to do so. Once I closed the door on the bezel, even at high speed, the chassis is really quiet.
While the DS2 is classified as a mid-tower chassis, Nanoxia stretches this to its fullest extent by increasing the length of the chassis from front to back, but keeping the height within the specs for this classification. In all honesty, this is more along the lines of some of the server chassis designs I have seen over the years. With all the extra room afforded inside of the DS2, you now have the option for E-ATX motherboards, which most mid-tower cases don't offer, and it offers room for a radiator built right into the hard drive rack. I didn't ever mention adding water to the top of the chassis, but it can be done as long as you use a thin radiator. Anything thick and you will run into issues clearing the motherboard heat sinks or memory. There is a flip side to this though, if you did want to water cool with more than just the dual 120mm option the drive bay affords, with the holes in the rear of the chassis, it is simple enough to just hang a triple radiator off the back, outside.
Without a solid listing with a price inside of the US, I can only speculate that these will cost either the same $79.99 going dollar for pound with what I have seen in the EU market. To be honest though, even if they go with the current exchange rate and offered the chassis in the US for more near the $120 range, I think buyers will easily pay it.