We haven't had any trouble with CPVC. Ever.
OK, that statement was a little overbroad, but most, if not all construction defect plumbing problems are with the plastic systems and not copper.
I agree with you that copper is superior, however in the DC Metro area for the past few years there has been a problem with copper pipe springing pinholes and leaking causing quite a bit of damage. It turns out that all that pipe was from one manufacturer but I just wanted to point out that there are some problems with copper.
I will never allow anything but copper in my house though.