I bought three different units and had professional plumbers install them.   You could tell the difference as Amherst uses a lot of chlorination, especially when spring arrives.  So far we're happy with two of them.  This one - with the wand, has a series of tiny black cracks in it where the hose connects to the body.  My plumbers showed them to me and said not to run it full blast.  It still leaks at the joining point, even at a lower flow.  The plumbers felt you should send me another part or an entire replacement and I'll be happy to have them come back and change it out and I'll send you the one with the cracks.  If you'd like to speak to the plumbers, I'm sure I can set up the call.