I just got this email from Tripit:
TripIt Pro just paid for itself!
Your flight United Airlines 535 departing on 3/3/2016 may be eligible for a refund!
Price paid: $1,196.20
Change fee: $200.00
Current price: $336.20
Your airfare credit: $660.00
Fares change quickly and are not guaranteed.* See details on how to get your $660.00 refund now!
There are just two slight problems:
1. It's still within 24 hours of booking, so I wouldn't have to pay the change fee.
and the really big one:
2. I booked business class and the fare they are comparing it with is economy class!
Way to go Tripit Pro -- and by the way, I asked you not to send me this type of email on my preference list.