Update:
I had only used the UFO 5m twice over the summer as the wing was keeping me busy

But since I changed my foil to the axis black series HPS880 I thought I'd give it a go with the UFO. And... holy **** who thought HA foil wings actually works really well for kite foiling and specifically with a strutless kite?

The axis HPS wings have an insane amount of glide, and actually turns really well and with the drift of the UFO it just follows me when I'm carving and gliding downwind just like I do on the wing. The UFO hardly requires any bar input and is fun to loop. Because the UFO doesn't pull you, you have way more freedom and any extra glide from the foil will be advantageous. I use a rope slider and 20m lines (will probably go shorter lines one day).
I enjoyed the 5m so much that I got a 7m as well. However I was a little surprised it doesn't turn blazing fast like the 5m despite only 2m bigger. It does however turn much quicker than my ozone alpha 8m.
I've crashed the kite a few times and always managed to relaunch it quickly. Thanks to the narrow span, low aspect ratio and rounded shape, it turns around really easy.
Even crashed it trailing edge side down but with a bit of patience I eventually managed to relaunch it.
I highly doubt I'll be tempted by the 9m. For super light winds I'd probably prefer a single strut or foil kite. Keen to hear if anyone has used the 9m?
Looking forward to trying the UFO with the smaller HPS700 foil, it should be insane