Ugh. I haven't needed to use this at all until this week, and have a flight I could have benefitted from changing one or two hours earlier - was the same price when I booked, but had a meeting cancelled.
Seems like this benefit is not really a benefit at all any more. As mentioned earlier, it could have been limited only to Platinums (which I'm not for now, but I'd have understood); the window could have been narrowed to a few hours to avoid the 'cheapest / last flight of the night' scenario; or they could have even introduced a nominal fee. As it is, they may as well just have removed it entirely and just incorporated it into their existing flexible fare structure.
Disappointed to see it go, and one less reason to bother working back towards Velocity Platinum.