I've got TRVs in four of my rooms and find they work very well. OK, I've had to replace a couple of them over the years.
I've an old gas fired back boiler with a thermo-syphon hot water system and pumped heating.
The times I've seen TRVs not to work are when one partner walks into room, thinks it feels cold and turns the TRV up full, only for the other to later think the room's too hot and close it right down. One such family asked me how much it would cost to install TRVs, only to look surprised when I asked if the fitted ones weren't working.
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