Did you shorten the seat tube a bit on the bigger frames? I have the 2015 model in size XL and besides the (now solved) problems inside the steerertube (dontknowtherightnamesry) and beeing not compatible with 30mm axles the quite long seat tube is my only criticism. I use it for trails and bikeparks and everything else. For the mentioned points i would definately go for the 2017 model.

 When will these show up on your Webstore?