None of the F510 bizjets are up there until the last 90 minutes of cruise. And rarely worth going up there. At F450, you’re usually above the worst of the headwinds and likely too high for the next tailwind—there’s trade-offs like anywhere.
The Global was pretty solid at F470/490, if you were at the right weights. No low speed cue up to 25 degrees of bank, even 45 degrees at F450 was solid. Did steep turns occasionally at F430 and F450. Interesting and small pitch changes were really exciting.
GF