From my experience, unless you get stapled (which happened last year but not this year), the airtime on the main two hills of Helix has been the best of any coaster I've done (including Expedition GeForce, Goliath, Balder, etc.). It's just so strong and sustained, the restraints work perfectly and the trains give you plenty of freedom. Also, the placement of them on the hill-side give you an extra sense of height and an amazing view. The last hill at night makes you feel like you get ejected towards a lit up Göteborg, it's something else <3
The twisty hill before the pretzel loop gives you some lovely floater and again, a good view, but is not a particular highlight. You do get an amazing pop of airtime mixed with loads of laterals at the dive after the Zero G Roll. It's fierce <3