We used to have a Drayton Digistat 3, which was quite old and started to switch itself off leaving the boiler in its last state, i.e. on or off. I also found the Drayton incredibly complicated to configure over 7 days and I normally quite good with these sort of things.
The Honeywell CM907 is brilliant and much easier to use than the Drayton! I love the fact I can not set the room temp down to .5 of a deg, where as with my old thermostat I found 21 a little too cold and 22 a little too warm. I also love the "Day off" feature, so you set all your times up for the weekdays and weekends and if you are off during the week, you press the day off button and it runs Sunday's program, so you have a warm house all day. Also I like the party feature, so if you have friends over for dinner and run late past the heatings programmed time, you can press this button to make the heating run and extra hour, or set how long you want it to run, after which it returns to its normal times.
It is covered in easy to use buttons so you don't have to click through tireless menus to find what you want, one or two clicks and it is doing what you want it to do. It is packed with all sorts of features that will make your life easier.
Really easy to install, took me 20 minutes! Mine was connected to a Combi Boiler so all you have is two wires to hook up.
I highly recommend this product to anyone out there who either wants to update their existing programmable thermostat or wants to replace their thermostat with a programmable one.