So i just got a decent deal on a used pair of chinese BGA rework stations locally (paid 1.8K), with the plan to keep one and sell the other. Im yet to power either up, but i assume them both working. The ZM (ZH?)-R6200 has a partially torn down head (see pics, i have those shroud pieces), which i also saw with louis Rossman's machine, so perhaps there is a common failure point there? I also believe (at least according to rosman) that there is an issue with the ZM only having a setting for remove chip, not place? My use case is mostly for new prototype assembly, not really on repairs.
Looking at the physical machines and specs, both seem to have comparable specs and different pros and cons to the build of these (one uses belt, the other rack pinion, WDS uses HDMI display, ZM uses older rca style). Both seem to be very similar machines, supposedly made by seperate companies.
My big question would be if any owners or operators of these machines have any input on this decision, whether that be user interface, common failure points, quality of alignment, things to look out for, etc? Very little information is available out there (apart from demo videos), and i am a complete noob to BGA soldering (never done it before). Thanks.