Not sure if this qualifies as "TODs" but here's the summary of my Upgrade Offers so far in 2018:

Date of Purchase: 3-14-2018
Date of Travel: 8-18-2018
Itinerary: Two o/w tickets in "G" class ORD-TPA
Offer: $159 each to upgrade to "P" Class
Offer Date/Execution: o/o/a April 1
Decision: Accepted and purchased the upgrade
Rational: o/w tickets were $62.50 each; lets splurge and I need the extra PQMs

Date of Purchase: 4-7-18
Dates of Travel: 5-16 to 5-28-2018
Itinerary: R/T RSW-ORD-RSW in "G" Class
Offer: $510 to Upgrade RSW-ORD; $159 to Upgrade ORD-RSW
Offer Date: 4-7-2018 (immediately after purchase on line)
Decision: Pass on the RSW-ORD; Accepted and booked the "P" Class upgrade ORD-RSW
Rational: Ticket for Daughter *S MP who needed some extra baggage allowance for the ORD-RSW segement; also the extra PQMs will help her remain *S

Date of Purchase: 4-27-2018 (still within the 24 hour free Cancellation Window)
Dates of Travel: 6-21 to 8-7-2018
Itinerary: (1) R/T ORD-TPA-ORD and (1) O/W ORD-TPA all segments in "G" Class
Offer: $159 to upgrade each segment to "P" Class
Offer Date: Immediately after eTicketing
Decision: Pass on all
Rational: Possibility that we might cancel or change the trip and the Upgrade Fee is neither changeable nor transferrable