Nice article from Canadian Preppers Network on the differences in pressure canners. The article compares Presto to All American and give the pros and cons of each. I want an All American and I am putting it on my wish list for Christmas. I have to say after reading this article that I am glad I can buy mine in the US because they are expensive in Canada (very expensive).
http://www.canadianpreppersnetwork.com/2013/03/presto-vs-all-american-pressure-canner.html
Presto 01781 23-Quart Pressure Canner and Cooker
All American 921 21-1/2-Quart Pressure Cooker/Canner