I have 6 of these shower heads in 5 different bathrooms.  Very clean and upscale design for the price.  However, one started leaking very badly and is also dripping (possible valve issue too).  Upon inspection it appears the internal gasket in the showerhead is deteriorated.
Unfortunately the leaking showerhead is in the master bath which has double heads.  It appears I will have to remove one from another bathroom to keep matching heads and replace the defective unit.  I am now concerned about the longevity of the remaining showerheads.