I would echo the sentiment expressed here about the reliability of the 500 series, even though it is older. I have had a number of Meridian products, including 502, 518, 565, 508, 568, 598, G68, G98, 800, and 861. Other than sending units back for upgrades, I never had to have a repair done on any of the 500 series componenets. The same cannot be said for the G series or the 800 series.

My Kit: 861v8+ID41, 800v4, UHD722, MD600, MS600, MS200, Oppo BDP-203, Genesis 201, Genesis 350 SE, Genesis S4-8 Sub, BG 520i, VTL MB450 II, Krell Showcase 7, Genesis 928 Subs, Danley DTS10 sub, SVS Ultra 16 subs.