I bought that case and it’s not great quality and does not look as good as the picture. Also it is flat pack so you have to bend all the pieces and the toggle switch feels terrible. So definitely overpriced for what you get.
I didn't buy the case so I can't comment on quality. Just that asking $150 for a mini-ITX case is in the ballpark for what I expect to pay. Most small-batch ITX cases are also flat pack. All the dan cases, formD T1, among others.