Electric muscle stim for recovery

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so I used to be a /fit/ fag, however I had to have several major surgeries to fix the fuckups from previous surgeries and basically had to quit exercising for half a year. As my full body mobility is still slightly restricted, alongside my rehabilitation exercises I was recommended to use muscle stimulator by my surgeon, saying his patients had very good results with compex sp 6.0. What is /fit/s opinion on muscle stimulation, and if it really works as described, is it a good idea to cheap out on compex and buy something chinese which does not cost 600 quid?
>tldr: does electic muscle stim work or is my surgeon just paid to endorse ridiculously expensive pieces of equipment?

pic unrelated