Hintz was behind the "Sub4" engines......they were a failure.
Then he got into redrives........issues there
Then he got into component design/construction.......issues there
Many folks found that when their purchase had problems, engaging with Hintz was not a good outcome......for them. ( he usually blamed the buyer, or the buyers engineer, even a brand new purchase, never used, that had a defect was a sh!t fight to get help, more often than not, the buyer just outsourced the component, and copped the costs )
Re packaging, return freight costs, transit delays, etc etc, red tape ( customs ) all these make the problem even greater. One can find ones self grounded for a long long time.
Some yrs back a oz chap was the go to man for problems etc, he eventually stopped.??
But.......there are folks, that have had good experiences with Hintz.......go figure.
I for one, have had good and bad dealings with this chaps products, it's a it of a lottery .