Unfortunately I have not used it either. I just got an email from them saying they had the true stitch regulator for my machine. I do know it has to be purchased in addition to the machine and cheapest I have seen people post is $999. at that price I'm going to keep practicing my FMQ
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To Giddyupandgo, I upgraded my little Brother from Wal-Mart to a Babylock Symphony and I'm in love. it has a larger throat space and sews like a dream. I have done some FMQ and love it but I don't have a regulator. you can get it for the symphony but it's an extra purchase. I bought mine new from a dealer and it was $2100 out the door.