Only "disadvantage" (or not) my shower hoses tend to let go a little faster since I have this shower head. Is the poor quality flexible or water pressure? Difficult to know. One thing is certain: your return on investment will not exceed a few months by buying this knob (tens to hundreds of dollars in savings per year between water and energy savings for heating of water).
If you want to do your bit for the environment and spend less water without having to time your showers, I highly recommend this shower.