OK, finally got a break in the weather that coincided with my lunch break. Anthony's flash is definitely better than the canned Flash Tune flash I had in there and OEM before that. The biggest immediately noticeable change is the reduced engine braking in S mode. It's more like my ST1300 used to be. I included reference to OEM because it was factory mapping and snatchy throttle that led me to seek out a tune in the first place. Throttle pick up after deceleration is much smoother, no more big jerk as the injectors come back on line. I think the reduced engine braking helps smooth this out as well. In fact, I going to have to retrain my right wrist a little as I'm finding I'm too tentative rolling back into the throttle now. This tune definitely gives you some feel (for lack of a better way to describe it) before getting back on the gas in earnest, allowing a more predictable, controlled application. The improvement is most noticeable in the lower gears, and now city driving in traffic and stop light to stop light can be done smoothly in S mode. What I am also happy about is that the throttle response at highway speed is still crisp, I was a little worried about that as I really don't care much for the lazy throttle response in T mode, regardless of speed. I did a combination of country roads, canyons, in town, and freeway riding and have got to say I'm very happy so far.
If Yamaha had done something like Anthony's tune as OEM, I frankly don't think there's any use/need for T or any other mode now. Maybe I'd use it in the rain or something. Sometimes I think the manufacturers screw up the driveability of some of the modes just to make them distinct from one another, ending up with no mode that's spot on. It's a marketing gimmick IMHO. My ST13 had only one mode and I never felt the need for any additional ones.
With respect to power, I'm not sensing a noticeable increase there, but the bike is so much more rideable and responsive now I don't care. The Super Tenere is plenty powerful anyway.