I just got a 2018, and had a 2017 at one point (Both AI's - don't ask
All that I have noticed is that:
* Mast and Aka clip upgrades come pre-installed - Otherwise you get them from the dealer for free
* The new trampoline are better designed (with a latch to tie them when rolled up and not in use
* The side pockets are rubber, not string net
* The adjustment button for the drive (which lets you select a number to spread them optimally) is a button on top of each pedal as opposed to a lever on its side (which you probably will notice all of the ONE times you will use it
I also had the 17 withy the 180 drives, so that would not qualify as a change
I hope this helps. AFAIAC, these differences are trivial to say the least. 15% is worth it (that's how I had bought my 2017, BTW)