I thought I would make this posting as there were a few people here that bought these TRV's when they were first released.
I sent 8 back because I found them impossible to get working properly. However I also had a further 8 supplied on a 'return whenever basis'. I can now report that I have them working how I originally expected them to work albeit with a few quirks that needs to be appreciated if one is to get them to work in a sensible fashion.
If anyone else is using them I would be interested in hearing their feedback