I just purchased the MacOS version and I must say I am pretty disappointed.
Current flow vizualization doesn't seem to work reliably - it goes from faint slow dots to nothing to bight fast dots with no apparent logic when clicking around or opening switches.
I don't see anything in the docs about resetting the simulation (e.g. emptying the caps in the circuit)?
The scope is also pretty hard to use, an ability to slow down the timebase would be useful.
I purchased the app after reading it was based on the falstad online simulator, but unfortunately I have to say the online app is easier to use and has less defects :(