Here is a comparison of the pros and cons for using the clip. The clip works best with lighter heatsinks (all size-related maxiFLOW’s™ fall into this category) and allows the use of better TIM (thermal interface materials) and easy workability. However, use of the clip includes extra parts for assembly but only two per set and the needed keep-out around the component. If the keep-out meets or is designed for the clip these problems naturally go away.