I have been using the Romer Optics Ez-Pushto encoders and this app since 2019. I have two GSO Dobsonian telescopes both fitted with the Ez-Pushto encoders. Once I figured out how to use the App, i have come to appreciate how well it works. I Initially align with Polaris, then add 1 or 2 alignment stars/targets. This takes less than a minute and usually enough to start using the App. The App also lets you add additional alignment stars (one for each zone) which improves the accuracy of the system. The App also lets you correct any alignment errors later in the session when you are pushing to a selected target, thereby allowing continual improvement of accuracy.
It is much easier to setup than my other motorized mounts (Celestron AGST, Skywatcher HEQ5, Meade LX200). Alignment with these motorized mounts typically take me longer than 10 minutes compared to 1 minute with the EZ-Pushto. Note that the EZ-Pushto works only with GSO manufactured Dobsonian telescopes, so comparison with the other mounts I mentioned is not an apples to apples comparison.
Overall great product, and it has helped me locate targets much easier and faster than Star hopping.
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OldCoder
NMJ-sw
Gallstone56