I got a chance to fly this kite yesterday, in the 10m size on 15m lines. I was riding a Moses T38 hydrofoil board on a 91cm mast and a 683/483 wingset.
This is the track I recorded:
This was the wind for the day, the above track was recorded from approximately 2:00-2:30PM, so about 10-15 knots of wind. Thew weather station is right next to the launch/landing point on the above track.
I am not a foil kite expert, but I've flown a few of them now. I found the Halo to sit slightly forward from where my 10m Soul sits (note that my Soul is also flying on 21m lines compared to this Halo on 15m lines). It feels slightly "racier" and a bit more like the 9m R1 I've flown in the past. Down loop speed seems similar to my Soul. It seemed to have slightly less of a grunty pull through the loop when you sheet out than the Soul does, which makes for smoother gybes. It seemed floatier as you brought it through the zenith, which should give more times for foot switches, though I found the timing odd, and combined with how far forward it sits, it was easy to feel like you we're going to outrun it as you gybed with it overhead. I think you'd get used to this quickly if you flew it often, though.
I don't know if I could have matched the same upwind angles that I recorded above on my 10m Soul, it seemed to go upwind quite well. It seemed to want to float "upwards" a bit while going upwind, and you needed pressure on the front hand to keep it level, whereas my Soul feels more neutral in this regard. However, going downwind, the kite seemed to float more neutrally, whereas my Soul sometimes likes to drop and you need pressure on the back hand here to keep it flying level.
I found the kite overall fairly similar feeling to the Soul, but that it liked to sit a bit farther forward in the window a bit like a race kite. The transition from the Soul to Halo was not difficult though, and I think that if you liked one, you would probably also like the other. Which one you like more might depend on personal preference.
I did not drop the Halo, so can't comment on relaunch. I like the F-one bar better than the Flysurfer bar, but I have not tried the brand new Flysurfer bar.