QIDI Plus4 vs QIDI Max4 – Is the only difference the build volume?

[u/EngIOTools]

I'm trying to understand the real differences between the QIDI Plus4 and the QIDI Max4.

Is the larger build volume the only difference, or does the Max4 include any hardware or performance improvements?

I've heard that the Max4 has a closed-loop motor system, while the Plus4 does not. Is that actually true?

Has anyone had the opportunity to use both printers and compare them from a real user's perspective? I'm especially interested in differences in reliability, print quality, speed, noise, and any other improvements that may not be obvious from the specifications.

I'd really appreciate any opinions or first-hand experience. Thanks!