I love it. I had problems with my hand two years back (pain in wrist, tingling in palm and ends of fingers). After I started to use it it went away. I switched to normal mouse (ROG Pugio) and pain came back. I thought it will take ages to get used to it but it felt natural after first 30 minutes. Now I'm trying to finally finish my Scylla handwire build to try ergo split keeb and hopefully ease my left hand too.