We have thermaskirt in our lounge/kitchen/diner. Generally we like them, they’ve freed up walls that were otherwise hard to use (eg for sideboards) because of the radiators.
They have 3 pipes running through from the boiler, so work similar to a radiator.
However, they didn’t entirely work for us because we couldn’t put them around all the walls (eg there’s none in the kitchen or on the wall where the chimney stack is), so we don’t really get enough heat from them. But that’s not really their fault, it is a massive space and we simply couldn’t fit enough of them to heat it.
As a result we put one radiator back in to help make it warmer more quickly in the mornings, and now it works well.
They were an expensive way to lose the radiators, but I love the look of the room compared to beforehand. We’d have them in every room if we could afford it!