I tried one during the winter of 2016/17. The Camping and Caravanning Club had a deal with a rental company and the headline price was £750 for 4 weeks during the winter providing a C&CC club winter sun holiday was booked. We had 6 weeks and travelled to Spain via France and enjoyed the break but it cured us of motor home envy. I think the deal is ongoing but not sure of current costs.
We are in Portugal now with car and caravan and surrounded by motor homes, one owner tells me he has been here for 4 months and has a hire car parked beside it! Needless to say, the majority of user / owners are retired but not necessarily in their dotage
Fine if you are going to travel extensively but otherwise a white elephant in my view.
Jim