My only 2 upgrades were at blue from Y+ to J. I was going last minute to look after my parents who both ended up in hospital within 4 days of each other (Thankfully ok now). I guess it was Dharma. As a Silver I have had nothing, but have had 5 out of 6 legs in PE with nobody next to me, so that is definitely a plus in terms of comfort. I've learned not to expect upgrades, so don't get disappointed. But sure, if they happen I'm always going to be happy