Disclaimer: I own an Ender 3, heavily modified.
Prusa printers are generally rock solid and their quality control is great.
For 1k, I really think we should be looking at a CoreXY machine (or, at least, something that doesn't have a bed that moves, whatever the kinematics). That's a major speed limitation, and it also causes vibrations even in lower speeds as you are moving the bed and your entire model. That's the only thing I cannot easily change in my printer, anything else, from the bed to extruders is easy to modify.
Sure the MK4 has a larger build volume. But so do many other printers.
The breakout extruder board is a nice thing but it is available for other printers too.
I like the loadcell concept for bed leveling but I wonder how much better it is versus a simple bltouch.
I really wonder who is the target demographic for this printer and why they wouldn't get other Prusa offerings instead.
> I love their commitment to open hardware
Prusa is relatively open with their hardware so it's indeed a massive bonus versus some proprietary Bambu Labs printer. However, they are the same company pushing for pre-sliced files which is a terrible idea. Not only they can be malicious, but they will also be specific to a given printer, which would benefit Prusa if most gcode is created for Prusa printers.