I don't leave many reviews unless they really deserve it and this extension does in the most positive way. First, besides saving me the tedious and time consuming task of editing hundreds of extra fields for different K2 items, the support for the extension is first rate. There was a small jquery conflict and Mohamed really went the distance to come up with a solution. His support for the extension far outweighed the small price I paid for its use. This extension is a great value and does the job well. I highly recommend it if you need a way to add multiple extra field groups to K2 categories.