The interface is easy to use, but not uncluttered. The top half of the screen shows your data; the bottom half has tabs. A lot of tabs. If there is something a reasonable user might wish to do with a CSV file that this program doesn't have an option for, somewhere, I will be surprised. Delete a column, sort by a column, edit a single record or set a value for a whole column, even swap the negative sign from the front of a number to the back--the feature set is incredibly rich.
The program is also capable of changing the separator from a comma to a tab, pipe, or a user-selected symbol, as well as many other manipulations. It can also export to XML, and this was the only feature I found which was "quirky". The XML file it output seemed well-formed when I opened in a text editor, but it could not be read by Microsoft's XML viewer due to an invalid (blank) encoding type. Removing the ' encoding="" ' tag in the XML file header fixed this problem and the file then opened perfectly.
I tested the program with several CSV files I use in my database work, and it opened even the largest (15 megabytes) quickly and smoothly. If you work with CSV files at all, I strongly recommend this program.