Westalee templates were a welcome Christmas gift. I haven't used them yet as I'm waiting for the Bernina foot #72. According to the Bernina video on ruler work the Westalee foot can be used, but the operator has to be mindful of the automatic foot being raised as it can damage the machine. This was for the Bernina 800 series.
If an accident can happen - it will happen to me! I'll wait for the right foot.