They are an interesting option to check a mix on, and can be fun to listen to. I have several 800 ohm small speakers that will run off a headphone amp, sounding really good in their way. Making a full range array out of multiples, on a baffle board, improves the sound. Antique style tube guys will run speakers like that directly off a power tube, cap coupled rather than transformer coupled. Lots of different methods for enjoyment listening, but won't ever be first choice for serious monitoring.
ElectroMagnetic Radiation Recorders
Tape Op issue 73