Danfoss is a well respected UK manufacturer. These valves are well made, albeit a little bulky compared to some of the latest models. A nice feature is the ability to fit the valve either way round - the FLOW or RETURN setting is changed by simply rotating a plastic collar - makes installation trouble-free. Only negative I can find is the lack of a fixed upper-limit stop, so the maximum room temperature can't be preset, but most people won't find this an issue. Good value and well made.