Worth, I have the All American with the gauge (with no way to calibrate/test it), and 2 Presto canners with the 5-10-15 weight gauge. Frankly, I prefer the Prestos - they are lighter (and I'm getting older) and they can be monitored by ear rather than checking a gauge for 100 minutes if doing salmon for instance. I actually bought the weight gauge for the All American, but cannot get it installed as the original over pressure vent is immovable. The All American does seem to be more sturdily built and has a metal to metal seal so you'd never need to worry about replacing a gasket.
Our altitude is a bit over 1900, and I'm sure there are a lot of preservers a lot higher (? Denver) so I think the 15 psi weight needs to stay.
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