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Does the job, *rather* well. May want to look at the following:

1. More descriptive error messages.
2. Provide filter for default action on error?

Plugin is simple and works well. I was able to import my 770+ users and only needed to break my import file into two parts.

I was also able to extend the basic functionality by hooking into the provided hooks built into the plugin. Nice!

Thank you for putting this together, saved me a ton of time.

I have used this plugin for a couple of websites and the recent update (to include 'updating existing users' is extremely useful and makes this an awesome all-around plugin for importing/updating any types of members on your site (with wp_usermeta included in the CSV file as well if you so choose)...

FOR THOSE WITH ISSUES OF PASSWORDS RESETTING WITH USER UPDATES:
I had this issue for a little while, but have found a solution that I hope the author implements after reading this (and if it works with his/majority of other plugin user configurations):

Whether you build your own table to import - OR - borrow from the example file provided by plugin author, you may want to completely DELETE the column 'user_pass' - NEW users will still receive an auto-generated password and EXISTING users will NOT have their passwords reset consistently upon every import you make...

This has helped me on about four different websites since the update, so I am thinking that my solution may help others out there who keep downgrading this awesome plugin...

Excellent job Ulrich Sossou - You the man!
Roger Sanchez

PS: If you find this helpful, you can put this in your documentation to help others with this issue...Have a great day!

Great plugin, simple and fast.
Thanks a lot!

Great plugins, did everything I needed. When I had any issues with my own CSV file it was easy to fix everything up then run the CSV through as an update. Nice work.