This app is basically a wrapper / skin around your Chrome Browser.
The interface is identical to what you get when using Google Calendars, but instead of it being in a browser, it’s in this app.
The integration into Mac OS is pretty weak. You can put an icon into the menu bar, but it’s just a simple shortcut to open the app. It’s not like there’s a quick drop down interface that would actually be useful for simple views.
Yes you can access multiple Google calendars and accounts, but you can’t see them in a unified view. It’s basically like having multiple tabs open in Chrome and just tabbing between the calendars, but instead of tabs, you have to click your profile photo in the upper right.
I’d save the $2, and invest it into something that’s more useful.
eywu about CalendarPro for Google