Canning in Half Gallon Jars

Here at Pressure Cooker Outlet, we will be the first to admit that yes, it is sometimes hard to find a canner that will can in 1/2 gallon jars. So we did a little research for you:

The Mirro 22 quart Pressure Canner can hold four 1/2 gallon jars.

The Presto 23 Quart Pressure Canner can also hold four 1/2 gallon jars.

Have you had any experiences canning with 1/2 gallon jars? If so what works for you, what doesn't, and what tips and advice do you have for people looking to can in that size canning jar?