First off, the In Win D-Frame Mini is not for those with a reasonable approach in life. There is simply no way to justify spending 350 US dollars on a chassis like this for that crowd. If you are one of those people, you might as well stop reading to take a look at the In Win 901's review here on TPU.
Now that we got that out of the way: The D-Frame Mini is actually an extremely sexy chassis. More so than the original D-Frame as it offers a better overall shape, more subtle design elements (no more are the huge knobs holding the glass panels in place, for example), and the ability to hold a 240 mm liquid-cooling setup. And don't let me forget the obvious: The chassis comes pre-assembled right out of the box.
I won't even go into any of its "shortcoming" as those aren't something you would care for when looking at the chassis. And it does deliver quite the potential in terms of what can be stuffed into the chassis. The only real issue one could point to is the lack of additional hard-drive-mounting possibilities, which may be forgiven considering the fact that most Mini-ITX boards only offer four SATA ports. But the D-Frame Mini should then at least have four HDD trays instead of the three it does.
So the D-Frame Mini would be perfect for you if you are of the unreasonable type who loves that unreasonable car because it looks cool or that "naked" bike because you can see everything that makes it tick, all while gunning it down the street - even though it costs three times as much as other potent Mini-ITX cases out there. In Win is known for going all out and the D-Frame Mini is just more prove to add to the lengthy list of crazy cases that have sprung to life through the minds of their designers.