hey Quiltermelanie,
I think the Stitch Harmony stitch regulator is probably the same as the one in the Handiquilter Insight table since the Regent is almost certainly made by Handiquilter for Babylock. I splurged on the Insight table last year when they brought one out for the Sweet Sixteen and have found that the stitch regulator works very well once you learn how to work with it. First, you need to make sure you always have at least 2 extra inches of backing and batting since you need to keep both "eyes" in the table covered by the fabric for the stitch regulator to work well. Second, you need to be careful not to twist the quilt on the table as you're doing curved designs as that will cause the stitch regulator to start stitching a mile a minute- it can't handle the difference in speed that occurs from one side of the quilt to the other when you twist. Finally, you will need to learn how to adjust the idle speed to suit you when you are in cruise on the regulated mode- that just takes some time to figure out how fast you prefer for the needle to stitch when you aren't moving the fabric (like doing sharp corners, etc.)
Hope that info is helpful to you in your quest for a sit down.
Rob