Thanks everyone for the encouraging posts.
Curious if anyone else has upgraded recently, like within the last couple of months?
I upgraded 5 tickets this past week to dvc AP's, all on different days, at either MK or the International Gateway. Overall, no problems whatsoever. I started with a test of one ticket (mine) at MK just to confirm what the price would be...it ended up being $31.95 for the 6 day NE (purchased from UT before the price increase). Later in the week the one child's ticket cost $17. and change to upgrade.
One time at the IG the CM wanted to charge me $108. to upgrade an adult ticket. I said the ticket needed to be bridged up. She was the only one working the IG at the time and she seemed to have a bit of trouble with the process, but after I gave her my ticket upgraded from the previous day she figured it out. Not really a problem and if she hadn't been able to do it I would have gone forth and done it another day. The CM was completely polite about the whole process (as was I) and we both were left with a smile.
One CM asked me where I purchased the ticket, but had no problem with the upgrading.
Every single CM stated that the ticket would be backdated to date of first use of the MYW ticket, but a couple of times the expiration date was pushed forward to the day I did the upgrade; only one CM commented on this and from what I gathered it had to do with the order of operations during the upgrade.
Good luck with your upgrades and enjoy the savings!!!!