waterman dualgear tapered inlet pump?

does anyone know the pros and cons of this pump?
http://www.dmpeinc.com/catalog/Fuel-Pumps/Waterman-Dual-Gear-Tappered-InletOutlet.html

 

It's really cool looking. Does that count?

 

1 pro is the adjustable pump clamp so you can get the correct end float in your drive shaft without machining, i own and have used both, nothing to chose performance wise
i had 1 fail and replaced it with the lil bertha adjusted the tune up and run good with it,
i like the bertha its smaller shorter and does the same job, buying new id get the bertha second hand id use whatever i got cheapest,