Things happen very quickly in the world of A/F ratios and RPM. Without the ability to review and interpret graphs, you are missing a lot of info. Details and trends are very important and can often only be seen in the graphs. Logging with RPM is essential.

It was mentioned above that one brand showed a leaner WOT A/F ratio than another. Not a big deal. The WOT ratio displayed in not what is important. WOT A/F should only be set by the engine's response. Such as best MPH at the track or through dyno sessions and with plug readings. There is no universal A/F ratio that all engines make the best HP at. Just a range. So a wide band can not tell you if you have the optimum WOT ratio, but it can tell you if you have the WOT fuel curve right. Which again would be very difficult or impossible to see without a graphed log.