My only 2 treks around Tetherow was not long after it opened, and based on the recent images there are definitely some things that look different.
I'll offer the following opinions:
1. There are a handful of top-notch holes here. #1 asks you to hug the left for a more straight-in approach at a long and skinny green. Despite Peter's comments, #17 still looks stunning. A heroic short shot to a green set in a super cool rock quarry setting with tall walls on all sides. I liked the drivable #10 a lot, and the #12 offers a really cool, dramatic sand pit of doom down the left-hand side.
2. My issue with the earlier version of Tetherow was the greens. I think about Jack Nicklaus famous quote about the first TPC Sawgrass and stopping a long iron on the hood of a car. The first iteration of the greens at Tetherow was wild. Some pitching front to back. Steep tiers. Pin placement in crazy bowls. Some of this may sound appealing, and can be, but it just didn't quite work at Tetherow, although I again admit to not having seen the course since it was "softened."
3. It played pretty fast and firm back in the day, so the amplitude of the slopes can punish harshly. Shots a little off line catch the wrong bounce and are penalized heavily. If they kept it soft and spongy, I bet it would be a little more forgiving and appreciated a little more.
4. All in all you can sort of see the lessons of Tetherow in DMKs work at Gamble. Fast and firm presents a signficant challenge in itself, so flatter, simpler, more generous, even "saving" features that work better at striking the balance between challenging for good players but still enjoyable for hacks. Tetherow doesn't offer many breathers, either. I think about a hole like #12 at Pacific Dunes where you have a hole to maybe gather yourself. Nice and wide, flat, not much trouble around. Pretty simple green. Tetherow keeps the pressure on for the entire round.
I disagree, for the record, with anyone who says it's not worth playing at least once. Considering your other options in Central Oregon, it should be in anyone's rotation.