We'll agree to disagree on the Hayes bike. It's made down the road from me, and it represents the most significant advancement in lightweight small diesels in the last 100 years. No one ever conceived a diesel that size would ever be capable of anything near what theirs does, and development continues.
I rode my own gas KLR next to Mr. Hayes' bike one day and he had no issue keeping up with mine. A 650 that carries 7 gallons and gets 105 mpg under field conditions changes my world considerably, even if it's a bit slower and heavier. I can't wait for this technology to become more affordable and hit the competitive civilian market. It might be one of few uses of my tax dollars that I DON'T find offensive.
The Sherpa's a good unit. Parts are still easy to find, shares a fair amount of parts with its bigger brother and a few other siblings, yada, yada. I'd buy one in a heartbeat.