Really nice, but...
- It's in Holland, so that's going to limit the audience. Shipping something that big & heavy around Europe (let alone to the Colonies) would cost $fortune.
- €1800 (around US$1800, UKŁ1500) is premium money for such an engine. Even the best JP3s are only selling for around GBP1800-2000, and they're already in the UK.
- it's BIG and HEAVY. Too heavy for one person to easily move around without expensive machinery. And too big for most people (except those who live on farms) to keep.
It's a smashing motor though. I briefly owned a JP4 (without the alternator/electronics gear) and that was a beast. The JP3 is similarly beastly, I'd love it, but it's impractical for all the same reasons as the JP4, and too expensive to boot.