As others have said, once you get the hang of using a pressure cooker it is one of those appliances you will use on a regular basis. As to whether you get the electric model or a stovetop model, it is a matter of choice. I have a stovetop model and just love the results it gives me.
If you are looking for a pressure cooker/canner you might find this review helpful
Best Pressure Canners: All American Pressure Canner Cooker Review