Hi, sorry it's taken me a while to reply, but I've been away. The boiler and iSense RF have been working fine so far since February. Pretty much fit and forget. The iSense controls both HW and CH. I'm using a supply from Maplin to provide the 5V to the iSense. I also have the HW working off a thermistor instead of a cylinder stat. I started to draw up a schematic of the design that I need to finish off as it also shows how it integrates with the unvented cylinder safety isolation valve and diverter valve.
The only option that the iSense doesn't provide is HW boost. I leave the HW on from 6am to 9pm and so it doesn't bother me, but it might worry some people.