If they work they are brilliant.
I ordered three recently when they were on offer, one for Mr S, and one each for two of the daughters.
Only one of them would register, other two came up with message to contact nook , with a number to ring.
Obviously a bad batch, because they said they would send out a replacement and a return label, and when we recieve it, could we please return the faulty ones.
No hassle no quibble, just waiting for the two new ones to come now. X