Yes, MQX is a great machine quilting expo and there are many classes and demos on a variety of longarm machines. I was bummed to miss the April 2018 show as I was in California...
I have had the opportunity to rent time on an APQS Lenni and HQ Avante. In my experience, the HQ had way too many tension issues for me. I was hoping to make a LA purchase this winter but I am waiting for a demo on the Bernina Q24 and Innova. There is a Bernina dealer in Portsmouth, NH but I don’t think there’s an Innova dealer close.