They all have the same problem: the wraparound rubber finally take off electronics over time (between 1 and 2 years); it is a defect of mechanical design: When removing the key, the effort is supported by this single envelope ... so that eventually detach from the key itself.
Result: The electronic naked is very fragile and eventually grilling ... dust, a misplaced finger ...
After 3 keys to this end, I hang permanently.