CO2 brands

Does anyone have any experience with either the Aqualine Buschke regulator
gauge, or the Dupla regulator/alpha fitting?  I am considering buying my
own CO2 bottle from a gas place (much cheaper) and fitting the bottle with
one of the above regulator gauges.  The Dupla regulator (not the one that
comes on the Delta system) is about $100 more than the Aqualine.  Is the
Dupla $100 better or just overpriced?   

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