Shows are a great way to see and play with machines. I have been at MQX in Manchester, NH for the past 4 days and have taken some great longarming classes on different machines. I first attended this show 4 years ago when I started my research on LA machines. I can say that the machines have improved quite a bit and some that I did not like four years ago have moved to the top of the list today. I was surprised at the stitch quality and handling of an Innova on Wednesday and then got to use the new HQ Amara in a ruler class.
Many of the newer longarms have nice features...I think it is a personal choice and by test driving machines, you will find the one that fits you. I made my decision also based on local support from a dealer. Good luck.