Originally Posted by
getagb
This is one area where I hope SPG’s approach is adopted by Marriott. I get a noticeably higher upgrade % using the SPG app than at the front desk - but I notice almost no difference with Marriott.
Slightly different take: I get more UGs with SPG, period. These have been noted on the mobile app whether I check in or not, so it's not the mobile check-in that causes the UGs. It's that UGs are more common with SPG.