Juki is a Japanese manufacturer of sewing machines. Mainly industrial models. They are very fast and sturdy machines. Some of the models have been developed or adapted for home use mainly by quilters to use on frames.
I do know what they are and have seen them being used but have never seen a dealer for them where you could walk in and look at them. I know they can be purchased online. Those of you that have them, did you get to look at one at a dealer before you purchased? Ann in TN