4/4 so far this year on a BOS to SEA trip on T fares. The outbound flight on a Sunday night cleared automatically. The original return on a Friday night via SLC was pretty fully booked with no room in FC even for paid first, so I switched to flights with available upgrades via ATL ($50) and was instantly confirmed (these where booked in V and X, so I also got 1.5 MQM!). So yeah, 100% so far this year on top of about 75% last year on upgradable flights.