I don't know if the K1 is sturdier than the K2 because I haven't broken one yet (please no, please never), but we have both in our house and the K2 does seem a lot sturdier and not so fragile. The buttons on the K1 seem like they could just fall off where the buttons on the K2 are more intgrated into the frame of the device.mlewis78 said:2) He writes that the K2 is sturdier than his K1. Would someone here who has both like to comment? I haven't ever held a K2, but I know it's thinner. Just wondered if it's more durable/sturdy.