Well a Filco in the UK is near the 160-170$ mark from Keyboardco, the key cool from Qtan's ebay uk sale is about 90-100$ so considerable difference if the quality is similar.
If you are interested, then I will leave will with some final advices.
The built of the keyboard is solid and good. The main flaws of the keyboard is it keys offset/misaligned problem(newer batches had it solved or "improved", not too sure to what extend) and the random ghosting(under USB) when over 7-10 keys being pressed(but it isn't really much a concern as normal keyboard also stuck under USB6KRO, so I will call it a draw there).
The so called "gold plated" USB wire isn't too durable in term of anti-oxidation(may be cause I came from a humid and hot country?). And you might had some minor flaw such as squeaking(will not affecting the function of keyboard) with those stabilized keys, namely spacebar. Remount or lubricate it properly will probably fix it, or else change the steel wires if it really bother you.
In short, the keyboard is a solid and functional board. But, it is not mean for a perfectionist that seek for a perfect board.