The NZXT Guardian 921 is an interesting looking case. The LCD display is well placed and can be easily read, while the door looks much like a shield. NZXT has designed a very nice case with a few interesting lighting aspects. With this case, you pay for the LCD and the overall exterior design as the interior is bland and very simple. So this case is really just for those who really like the look, which is - as always with NZXT - quite unique.
If you are looking to get the most for your money, you may want to look elsewere. It seems that a steep price tag is part of the NXZT line-up these days, while the cases lack the interior innovation found in other enclosures of that price range. Other companies with similar cases sell not just a few dollars less, but up to 25 to 30 Dollars or Euros. This makes it hard to recommend the Guardian 921. So where does this leave the case? If you love the design, sure go ahead, grab the enclosure, otherwise you may want to look around, as there may be other options out there, that won't cost you quite as much.