Lian Li cases aren't flawless, but generally better than others. Thick alu, smart inner design, quality of the work (except maybe for the fans they use).
Plus they are doing it for over 20 years. That's experience, right?
Actually they've been making aluminum cases for about 7 years, after Cooler Master and Soldam. Lian-Li started as a company making removable hard drive racks.