My Sweet16 is an older one that the previous owner updated by adding the tension kit to it. At first I thought it was just an unnecessary gadget since I was used to adjusting my bobbin and top tension to suit whatever thread or combination of threads I was using at any given time and I was reluctant to take the time to record what the reading was after I got my top tension set. However, after using it for a while (and diligently recording the number shown on the screen when the tension is perfect) I have found the upgrade to be worthwhile. Now, once the bobbin case tension is correctly set for the bobbin thread, I can look in my notebook for any given top and bottom thread combo and see what top tension number gave me the best result- this is a starting point that you may or may not need to fine tune for the specific quilt, but it saves you the initial step by starting out in the right ballpark.
Rob