To difficult to use, if you need a real custom registration form. And the code that is produced is very big.
Find it very difficult to adjust. This extension should have a note:
*** For United States Only ***
In General, Web Assist seems not to realize that the world not only consists of American customs and American Language. Have you ever seen British zip codes / phone numbers? French? German? Polish? Russian?
As a European you have to consider multilingual issues. So, this extension should be more flexible in adjusting to these issues.