I was curious about the name change in regards to when people hear your name for the first time.
When people hear the name Gusto it does not immediately reveal what it is. When they hear something with the word payroll in it, they can take a guess that it has something to do with payroll. Did you consider this when making the change?
I recently changed the name of my side project to make it more explicit because people just did not get the concept when I tried to explain it.