I had an '07 ZX225 with an HPDI and I currently have an '08 with an hpdi. They have been very reliable for me with no issues ever. I had an '06 175 HPDI with 400 hours with no issues ever as well. The ZX225 is great on fuel for a 20ft boat. I have the yamaha Command link on my current boat and it will get 4.8 mpg at 4200 rpms. BTW I will sell my 08 ZX225 which has a power pole pro series, Lowrance HDS7 with structure scan, Lowrance LCX 28HD on the front. It has warranty until July 2013 on the engine. I will sell for $29k