Only one local dealer wouldn't let me be the 'driver' in the test run. One of our local Viking stores. I didn't get my machine there.
I tried several brands and all the other dealers let me do the test 'drive' with the machines. I fell in love with my Pfaff and love it.
After you try whatever ones you want to - and even some brands you wouldn't try - you might want to consider if there is a big quilt expo near you and go there. They often have good sales on the machines demo'd there. The dealers don't want to schlep the machines back to their stores. That is one way to save $$$.