"Bought this to replace a 23 year old Landis & Gyr controller which had decided I needed the heating on at 2AM!
Does exactly what it says. Easy to program and use. Although the instructions said it would fit (and did fit) the existing industry standard back plate I changed this to the new one as supplied with the controller. Very easy to swap the wires over one at a time. Took about 10 minutes to fit the back plate and about the same to program the unit.
Very pleased with the product so far and with next day delivery from Screwfix."