It is a very extensive program that has many administrative tools for your spreadsheets, allows you to link and save everything in your google account to be more sure not to lose any document, has many templates to facilitate the tasks in a wonderful way, the different options you have make it one of the best tools for spreadsheets as it adapts to the needs of each user making this tool also one of the most complete.

I like the easiness of importing csv and other excel files onto google sheets. I don't have to use import range all the time which is limited.

There is an IMPORTRANGE function within G Sheet but I think this is a very cool automation connector between sheets. Definitely will put it to good use.