The quick-connect fittings and hoses do indeed make for easy installation, but they also cause the water to flow around several sharp turns, and that not only slows the flow but also gives places for minerals to deposit.  The small opening from the hose fitting to the cartridge fitting is always clogging up, and I go from "low flow" to "tiny hard spray" as the water gets restricted.  I like the look, if only it worked.  I'd cut off all the Pfister fittings and convert them to normal, straight-flow connections if I could, but all the plumbing stores I've visited say they have nothing that can do that.