Ditto for me... I didn't even see that was a new feature. I have the same model as you, SD49225T-HN.
It's working great - Zooms in from 1.0 to 25x in these increments, generally: 1.0, 1.7, 2.8, 4.7, 7.9, 13.4, 22.7, 25
If starting out at a different zoom level it generally increments in the same type of ratio, I guess. I didn't do the math.
It also seems to work quite well at centering at the right spot where my cursor is.
I wish I had known about this feature earlier. It can be a little frustrating panning and zooming manually if I'm trying to track a moving target (pesky door to door salespeople for example) and sometimes I get the mouse in the wrong spot and zoom out instead of in, or pan instead of zoom or vice versa. This will be much easier. Now if there were different combos to zoom out, or merely pan instead of changing zoom, that would also be nifty.