Some years ago they had one season where the Spotz was considered THE fastest of all foils, around a course. With season I mean spring-summer-autumn here in Europe.
My friend James actually rode 73 km/h (just over 45 mph or close to 40 knots) on that one back then, amazing
After that period Spotz and Taaroa was neck and neck as far as I remember, one faster downwind, the other faster upwind, evening out.
Now there are a few more offering top racefoils, but still a tough market, because many of the best riders get discounts, and the top riders are PR.
And those "wannabee" racers, not racing much or any, but loving the speed and performance, often buy the used gear from racers (at least here), because you get extreme value for money this way with top notch half a season max one season used only
So it is those between who pays full price, so a smaller amount
The majority of kitesurfers, nowadays where it is not a niche market but more mainstream, want "allround" foils, whether that is fast ones, really slow surfing ones, or something in between.
Some want low cost foils, others want quality.
This market is what almost every brand want to take a cake of now - as there are loads of buyers, opposite to racing gear where there are buyers too but not nearly the same amount, so a really difficult business
A shame if Spotz "is no longer"