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What focuser are you using currently? I have that scope and when I started in the hobby, I'd manually focus with a bahtinov mask and then lock down the focus. But sometimes just locking would be enough to throw focus off a touch.
I then bought a PrimaLuceLab Sesto Senso. That's a decent focuser but not with any heavy payload because it connects to the fine focuser knob. The ZWO EAF is a better focuser in that regard, because it connects to the coarse focuser. Cheaper, too.
I sent my Sesto Senso back when I got my Esprit and bought the Esatto 3". It's a fantastic focuser, but if I were you, I'd start with the ZWO EAF. If you like it, great. Later on you can sell it and get an Esatto if you so wish.
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