I picked up a couple of DTAs at the Overland Park store yesterday and hooked them up today with no problem. (Well, other than the remote programming procedure in the TWC booklet that is 100% wrong. Just follow the method on the sheet in the box.)
HD locals are all in HD (except KTWU, which is questionably local anyway.) I was pleasantly surprised to find several of the extended basic channels are in HD. (ESPN, CNN, TBS, TNT, most Fox properties, a few others.) I was completely unsurprised to see the vast array of letter-, pillar- and/or window-boxing techniques used on the rest. Name a style, and you'll find one (my favorite? Skinny 4x3) . I hope they choose one consistent method eventually. The local secondaries are also available, although I had to go poking around in the 1250s to find them.
As I was scrolling through, I noticed things like HBO's channel showing a "you are not subscribed to this channel" message. Which makes me wonder if they might implement old-school single-channel premium subscriptions using this technology.
We'll definitely keep the DTA for the kitchen TV. The second one is in my wife's craft room, which is also hooked up to a Roku 3 running the TWC app and gets almost all the channels our digital boxes get. She'll make the call on that one.