The Glock design is famously reliable, and the 17 is probably of the most reliable of even the Glocks. My own 17 has NEVER malfunctioned in thousands of rounds, even though I only clean it twice a year. I have never been more satisfied with a gun's reliability.
I think it's a great gun. $500 with one ten-round mag would be high in my home state of Arizona, however. Before I deployed in January, I regularly saw them new-in-the-box for $459 with two full-cap mags. Gun values can be very regional, though.