From personal experience, yes.
If you have used high quality goods, you will appreciate Costar made keyboards.
If you are the type that accept cheapen mainstream products that tend to spoilt right after their warranty period is over, it' will be indifferent to you.
It's like buying a KIA or a Honda, the choice is simple but can you live with or should I say without?
There's good reason why Filco is highly recommend around here.
I have a filco and a keycool 87 here, and so far I don't really notice that big a difference in quality. Sure the stabilized keys on the filco feel a bit crisper, but I think this is mainly a lubrication/break in issue.
The only real difference are the keycaps imo. The text on the capslock and backspace keys is not really straight, backspace is spelled "back space", the arrows are hideous and the print for quite a few keys lacks detail (especially the media keys).
The filco is better, without a doubt. But "double the price tag" better? I'm not so sure.
On topic: looks like a nice kb, would've bought it in a heartbeat if I still needed a cheap mech for work.