I own or owned Kinvara 2-3-4, A5, Kinvara Trail. I just bought Viratta. I ran maybe 20 miles so far with them. It hitted me today when i felt the huge plastic thing located under the inside arch.... It hurts and gave my arch some kind of small electric chocs... Weird feeling. I never felt any plastic thing inside my other pairs. Size is the same. What's different with the Viratta than with my other Saucony shoes? I know it's a --kinf of-- zero drop and it's not the problem with me because i have no adaptation problem to zero drop. It is really the feel of the plastic piece under the inside arch. Anybody experiencing the same felling? Please tell me. So far , i dont't like the Viratta.