I got this for one reason only: to sync my STEPS from the Apple Health app to the FitBit app. Sadly, it doesnt work that way. Your "step activity" is counted and translated as "activity" in FitBit, but your step count in FitBit is unchanged. The app builder blames it on FitBit, but I blame it on false advertising--dont claim your product does something it does not. From Sync Solvers site: "Fitbit recently changed the Fitbit app (around Dec. 1, 2015) to exclude steps recorded as activities from the 7-day total. Your steps will still show up under the activities list but no longer in the totals. We realize this limits the usefulness of Sync Solver, but it is entirely out of our control and we are asking Fitbit to reverse this decision. This decision is actually just the latest example of Fitbit removing functionality from the API." That date of Dec 2015 is a load of crap--Ive had this app since Oct 2015 and its never synced steps.
Gumdrop92385 about Sync Solver - Health to Fitbit