SII got pretty far in that MB:AC Overture tourney that was held a long time ago. I think he ended up making it to semifinals, losing to FuranNingyou's Satsuki. But yeah other than that, I haven't seen him do that well in any other tourneys.
There aren't that many SII vids around; if you can somehow find the old Overture videos, there's plenty of him there. Otherwise, you can only find him on Yukinose's vids and maybe some other random ones.