Works fine for importing entries from non-Gravity Forms sources, pretty much unusable for migrating Gravity Forms entries, as it does not keep entry details like date/time.
Asked about this on their Support page, as has been advised to all the folks who asked the same thing in the comments here, haven't heard back in 3 days.
I'd give 2 1/2 stars here if that was possible.

When importing data for a large form it only managed to import a small part of the data.

Did exactly what I needed. I found another plugin that was 3x more expensive. Very happy with the results. Everything imported quickly and easily.

The support helped me extensively and very quickly. I am absolutely satisfied, of course with the plugin too. :)

The default version of the plugin didn't work for my particular set-up, however, developers were quick to provide me with a version that was adapted to work with my setup. Other than that, does what it says it does.

Works as aspected upon install. Great support for when I need a customization that was outside the scope of what a normal user would need.

Totally did what it was designed to do.

Works just the way it should. Imported 4000 lines of CSV data into a gravity form in ~2mins.

Worked perfectly as described.