Follow-up post since I didn't have a chance to write this fully at the time. I lapped Toro a few times, then went on other rides and came back to Toro for more.
Even though it was a preview day, ops were as good as could be expected for one train. There were several of my rides where they flew down the train checking restraints. Conversely, they often had to recheck the train, particularly cars 1, 2, and 5 (seemed to happen on most trains). No downtime when I was riding it, but I wasn't there the whole day.
My first ride was about mid-train, within the first 45 minutes of operation. Between the location of my seat, the cold weather, and the fresh train, it felt a bit sluggish, particularly through the back half of the ride, though I'm sure this will improve with time/temp. The ride here felt very smooth.
My other rides were all towards the back, focused on the last two cars. The ride was much more forceful (in a good way), especially on the first two hills and in the twister section. These sections felt much better than in the past; 'clean' rather than 'jerky' forces, which made them much smoother than they have been in years.
The twister section and the banked 180 seemed to be the focus of much of the track replacement. There are some spots (and this might just be the placebo effect) where I swear I could tell when we transitioned from a recently replaced to an older segment of track. The older segments aren't as bad as the ones that really needed attention, but once we see the full replacement next year, this ride will be running as it did during the first few seasons. The future track is still visible in the fmr. Northern Star Arena.
Overall, if you sit in the middle row of a car (avoiding the wheel bogies), you'll have the smoothest experience, but even in the rear car over the wheels, it was still smooth.