We display the average as n.n kts. to make this easier. A useful guide is to note the reading once per circle in climb. The difference in reading helps one make centering decisions. For mentally challenged pilots such as this author, it is sometimes hard to remember the previous averager reading. A single glance at the screen yields both the number and a sense that the number is increasing, decreasing, or stable.
Many pilots form an opinion of lift quality for the day from the averager.
These are reasons why we feel that numbers are the best way to display average lift. Cambridge gliding instruments have followed these guidelines for many years. The 300 series makes no radical changes. Q. I used to think a fast vario was what I wanted. I then began to realize that I probably liked a slower, smoother variation.