I've never used one of those, I just thought they looked like a cool idea. In AZ I would never even think about mounting that in the engine compartment. On my '72 I used an external Walbro with a return that went back to the tank. Originally the kit (Holley Commander 950) had a T to return the fuel back into the fuel line just before the pump. I vapor locked it the first time I took it on a long trip. Stopped at a parts store in Payson and rigged up the return line to dump back into a vent line to fix it.
It is a cool idea and I think it could work setup correctly. @mrk5 was taking a hard look at it for his crew cab before he bought the sniper setup.
Can I come lol ?