I use the next version up - Harmony Assistant. The main thing HA gives that I like is better control of the score layout, although that's a minute fraction of the extras Harmony Assistant gives.

Currently I use it probably three or four times a week, but a few years back I was using it for several hours a day.

I agreed with Pavane some time back to be careful with the names: Pavane's product is called 'Harmony' and it is quite different from 'Harmony Assistant'.