The DMT aligner is great. I have the whole system but I tend to use the clamp with bench stones if I need to reprofile. I usually freehand sharpen but it is great to be able to create a perfect bevel when reprofiling. If you already have bench stones you can just buy the DMT clamp and use it to hold your blade at a consistent angle relative to the stone. If you are looking for an entire system I would recommend the DMT over the Lansky. The DMT offers more angle choices and the stones are far better than the Lansky. I got the extra course stone to go with my DMT and it makes removing a lot of steel quick and easy.