I like using the spiral. However I notice differences between the fitting of the spiral on the chart depending on chart settings.

This appears to be due to the spiral always wanting to draw perfect circles. It can lead to certain rings falling at a particular price and time, but will easily change to a different price or time if you increase or decrease the top or bottom price settings, the size of the main window (maximize), of increase the duration of the chart.

In my opinion this is a pretty much makes this feature useless. The spiral should squish or elogate when chart settings change. Price and time relations should remain constant.