If you use product options, this is the one mod you absolutely must have. Works perfectly and saves an unbelievable amount of time. Now available for 4.4.1 which is fantastic news.

Cannot recommend this enough.

Easy install. Great if you use multiple variants across many product platforms. This allows you to set an option that is available to any product. Makes creating variats fast and easy. Now you don't have to create that same variant for red, blue, black, and green t-shirts everytime you add a new t-shirt design.