You’ll still have to wait for AAA to get there. If you should need to start your car in the morning when you need to leave right then in order to make it to work on time, then this can be a life/job saver.
Many, if not most of these little jump starters also come with the cigarette lighter attachment for starting your car that way.
I did see a Stanley Li-ion battery starter similar to these at Sam’s Club this past week for $39.99, in case anybody shops there.