Dataloader.IO is currently being used by the Enterprise Applications IT team, of which I am a part of. We decided to use the paid version of Dataloader.IO because it easily bridged gaps that other data loading Salesforce
applications lacked in. The UI is amazing, but more importantly, it is not a local download. Dataloader.IO is cloud-based and can be accessed anywhere with internet access from any computer. Other applications require a local download and take up memory and processor power on your local machine during data loads, or extractions, which could slow you down when working on a large project. The ability to easily extract data across multiple objects makes this tool even more powerful. If there is a lookup field on the object you are extracting data from, you can also pull data that is related via that lookup. Features like this are super important, but our number one reason was the ease of extracting Salesforce
attachments in bulk and in original file format! I am not aware of any tools, at least free tools, that allow you to extract files in original file format. This is critical when migrating data across Salesforce
orgs, and will improve not only data quality but the stakeholders percieved value of the data being migrated.