All I've done to my Prusa MK4 is change the part cooling shroud. Great out of the box. Been bringing on it over a year. Works great right away even after sitting for a month.
IMO, of you felt interested enough to go through 3 cheap printers, you ought to get a decent one. That feels like justification enough to me.
It's getting there. They've been taking a progressive improvement route. Searches sometimes work, mbid searches more so. They are building a cache/index of some sort, so it's taking time for that to populate, and it'll have a higher success rate as the progresses.