We saw a small demonstration unit and decided to take a risk, having already dispensed with a boiler. ThermaSkirt is heating the house on the air source (heat pump) only; even when it was -14°C outside the whole house stayed comfortably warm.
Skirting heating gives an even heat throughout the room, has the ability to react as quickly as radiators, and does not act as a storage heater like under floor. It also allows us to put furniture anywhere we like, and we can have floor length curtains without the risk of pumping heat out of the windows.
To me it is a "no-brainer", whether new build or up-dating any property to fit skirting heating, and I certainly would never use anything else.