My car has done around 500+ miles now, and I have also driven the factory car quite extensively i.e 300 miles or so in it.

The factory car pulls much more strongly at low revs in higher gears than my car. That may be down to the mileage. If I try to accelerate in 4th or 5th at below 3K revs my car simply gets much noisier with very little change in forward momentum! However above 4K revs mine really starts to come alive, and things get progressively more interesting beyond that! It's definately a screamer, and as mentioned previously I think would benefit from a lower final drive for road use to keep engine in power at typical sensible road speeds. It's not a quiet cruiser.

Conversely the Roadster always has power on tap even at low revs in top, and based on comparing the two back to back is a better touring car (at least would be with the better chassis/brakes etc).

Just my views of course, others will differ ...

Ferrari 488 Pista
Porsche 991.2 GT3
Porsche 718 Spyder
Caterham 620R
BMW M2
Porsche Macan Turbo