The two cases I've gotten from them seen decent. They have always had low end and high end case. The sub $100 cases are always a little weaker than the $200 cases they make (thinner medal) but the design are decent. To be honest I'm overjoyed with the pc-q33 cases I've been using. They run circle around the elite 130 for itx. The full tower (pc-a75) I have is also a joy compared to the previous case i had been using. both of these cases are mid-lower end - the pc-a75 was like $120 but it runs ring around the rocketfish and asus case I had previously. Yea there are $200+ cases that might be nicer but for the price point i can't beat it.
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I guess it might help if you added details why you think the quality is lower.