Two recent refits of waterjets are unique in one respect that they allow a direct comparison between waterjet brands, while everything else remains unchanged. Waterjets from Marine Jet Power were recently used to solve some significant propulsion issues and in one case the exchange even helped a yard to achieve its project goals leading to the fact that the yard finally was able to deliver the ships to the owners. In the first case, the operator of a 10-year-old vessel decided to change to MJP DRB jets due to significant service and corrosion issues on the existing waterjets.