I have had two of these Robart pumps. I picked them up at a swap meet, they were in the box of stuff that I wanted something else out of.
Any way, I decided to try them out since the instructions were in the little box. A well used Fox 74 that was extremely reliable was the test bed on an old Super Hots that I moved the tank closer to the CG. They worked just fine once the plumbing was done, its been awhile so I can't remember which line went to where. The Fox 74 with the air-bleed EZ carb had no problems with the pressure and I never had a deadstick or a leaning problem with the pump in place.
I thought they worked as well as anything else, just a little more complecated to plumb.