I disagree.
My friend had two. After a while both were hanging on his wall just as decoration. I took one to try out. The ball was not working because of dirt, cracked it open, cleaned, superglued back and used for week or two, then again the ball got dirty. Kinda liked the size, but clicking felt weird and the scrolling ball was bit uncomfortably placed. So again cracked open, cleaned and gave to my mom. She used it for week and changed back to previous one.