to date hifis are still my favourite kites of all time.
ive changed brands a few times and will probably do it again next year because of the $$$ but im nothing but stoked on my 9m 2010 hifi.
its got quite versatile tuning so you can make it fly fast and loop hard or truck for bindings or set in the middle for a mint all rounder etc bla bla pimp pimp.
hifis have always been sweet for kiteloops, the first ones i had (original hifi) had some gnarly pull behind the loops, the 2010s refined and smoothed the pull out a bit but it still packs the same acceleration.
but all the same you should really go get a demo on one, asking on the forum you will just get personal opinions and everyone likes different things in kites.
i like them because they are powerful and you can go into tricks real fast to get lots of slack after pop, they make learning tricks easy and they depower enough so you dont get rolled every time you stack it ( i ride boots)
So if your looking for a good condition 2nd hand one im ya man as I am looking to upgrade