Haven't been able to use the ground marker since the ground is covered in snow but I love the chain markers. I use 2 to help me practice elevation changes on a flat surface
The outdoor marker and DiscDot is a fantastic tool. I’ve set mine for about 25 feet. I’m making more practice putts and my accuracy is improving as well in my tournament play!
The disc dot helps you train your eyes to focus on the basket with the key being "aim small miss small". The distance marker helps you know where to putt after measuring without eyeballing it all the time!