Great stress reliever!
My two sons,ages 11 and 14, have ADHD and their meds have a side effect  for them to pick at their fingernails or lips.  The Mobii keeps their fingers/hands busy so they forget about the picking. The rainbow ones are especially cool to watch the colored rings rotate while playing with them in their hands. The Mobii feels smooth and good in their hands (mine as well!)
Rating: 5 stars