I have soak tested it for a couple of hours as well as loading from tape (TZXDuino). Not properly tried saving owing to a lack of reliable tape equipment but it goes through the motions so should be ok!
All the keys work but the membrane is original. All screws and feet.
P&p will be around £4-£5 for Royal Mail 2nd Class Signed For (UK). Could potentially post outside the UK but it is something of a pain now.
Please PM me if interested and also post on this thread.