I too have a German factory nickle P220 that's as accurate as I can hold it...comparable to a cpl of my Colts...say ~2.5" from a rest at 25 yds with selected loads. To my knowledge, I've never had a malfunction with it in over 2000 rounds. LSWC's, JHP's, hard ball, it matters not.
The grips fit me well, Sig originals, and I attribute that to its single stack magazine. It's a large gun, with a high bore axis, which gives it a bit more muzzle flip than say a 1911, but manageable with any .45 acp load I've tried. Sights on my early version are dot over dot, which I find easy to align at speed and adequate for precision if needed. Mine are paint, but tritium would be a far better option, and absolutely necessary for nighttime carry, IMHO.
All in all it's a good gun, but when a .45's called for I generally pick one of my 1911's, especially the Sig RCS, a 4" bbl'd, officer's model gripped, alloy frame model. The 220, being just a bit bigger than I want.
YMMV, Rod