I had a 331 the Monster with 1.5 times the power of the 221. Nice unit and a teardown to clean the windshield made the unit look great and near new. Nice small units these low numbered xx1 sansuis.
Although I love the G-5700 I have, it's a close second to my old 5050 and 2000A. The 221 falls inbetween the 5050 and 2000A but I haven't had enough time to wring it out