Considering the engine was raced at LeMan, used on the Delorean and many other vehicles there seems to be quite a bit of hate towards the PRV. Later 2.8 look pretty decent on paper.
The PRV was also used by Winabago in a line of RV's in the 80's. I believe that just about 100% of the engines were replaced under warranty. The vehicle was much too heavy for the engine design.