I had a quick play with the harmonizer today.
It seems to be very easy to use, the bike had been fairly recently balanced with my 30 year old set of mercury vacuum gauges and so tiny tweaks were all that was needed.
Gauge mode enabled me to see that one cylinder was working a bit harder than the other, so just needed to tweak the idle mixture screw on one side to bring them together.
Generally the Hamoniser is easier to use as the readings are better damped than on the mercury gauges.
A very nice piece of kit.