Bought this digital programmer to replace the previous one which had failed (after 20 years). Fitted it easily enough and it does exactly as expected.
The only minor snag was that I had to use the back plate provided, rather than use the existing backplate in the wall ( pins in a differnt order) which as another 5 minutes.
Good product for the price. Does what it says on the tin. Note it is only rated at 1A so will need a relay on older systems to prevent overload and mis-operation. Other controllers are rated at 3A and are more suitable for older systems.