For a limited run of 6 cars, then fine. £200k it is. Imagine if they sorted out a more considerable production run of say 1000, 2000, 5000 cars worldwide. Then, the cost comes tumbling down to "sensible" levels.
Would I have one over an M3 or a C63. I'd need to drive one to find out.
However, a 500bhp small saloon with a proper manual gearbox has a huge appeal. Especially for those of us who like driving and dislike pulling paddles to change gear.
In short, if the price point was the same as BMW or Mercedes, it'd be a strong contender in my eyes.