Easy to use. Error messages are helpful. Good interface for keeping tabs on how much you're using against your license.

If you are starting to work with different data sources and you need an affordable tool to start aggregating and consolidating data, Stitch is your tool. They have a free tier that is more than enough for companies that are just starting to work with this kind of tool, connecting data sources is as simples as pressing a button and they have an easy to understand interface.

Very easy to use and able to connect to many different data sources. Also free tier enables to sync limited number of records for free. It is almost zero maintenance product where you set it up correctly and then it does the job.