The first (original) shower head holder lasted 4 years before the plastic part of the "angle-holding" mechanism failed, leaving the head drooping down showering the wall behind it. I have now had the fourth replacement fail in exactly the same way in 2 years (and it is only adjusted once every 50 showers or so). I suspect the springy part of the plastic element has been reduced in quality or robustness since the original, or a design flaw is now evident. I would not recommend buying this item as a replacement, and am now going to buy a generic £9 replacement - in white to match if I can.
Update 6/1/2014 - beware dimensions when ordering to replace - the shower hose is larger than most holders will accept. Mine is 19mm hose and 24mm riser-rail.
This one works really well, £6 + £3.50p&p at Jan 2014, fits the slider-rail and is a snug fit for the shower head (shower hose goes through the jaws of the holder and slides down so the jaws hold from the base of the shower head).