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I purchased a used old industrial Juki at a local sewing machine dealer. That way I can have it repaired easily. I'm very happy and can sew ANYTHING! Even carpet! Be sure to bring a sample of what you plan to sew and give it a test drive. That is what I did.
I like that it is not computerized and since I purchased locally at a reputable dealer... I can get it repaired on site. I imagine the older ones might need some repairing once in awhile, but so far so good!
Good luck! Do you have a local dealer that sells industrial machines? This is where I purchased mine from Mel, the owner: