Ankaret got me into them by lending me Shards of Honor/Barrayar combined which I read for Cordelia but then I stalled for a long time on Warrior's Apprentice because Miles was so bouncy and irritating. It was Komarr that got me back in and then I went forwards for Ekaterin before going back and filling in the gap. I keep searching for fic that makes up for Ekaterin disappearing in post-marriage canon but have not had much luck.