There are other free google maps plugins that may have a little more features. However, the pro version has saved me countless of hours as a developer. if you are a developer, this one is by far the best and easiest.
My client needed a map that was self populated by the users. The pro version of this plugin has very clean script and has a very easy to understand DB structure. It took less than 30 minutes for me to write the code to auto-populate different locations on several different maps, with different pens, pictures, links, and text based off of my user's feedback. I was expecting to spend 5-6 hours just on this feature.
This will be a standard plugin for all my developing.