The flaw with all these roller transport processors is that there is a very narrow margin where the throughput, air exposure and chemical forward transport are in a stable balance with a volumetric replenishment. In every other scenario the chemistry collapses frequently, and needs to be replaced after cleaning the entire processor. And the said stable state seems to be only reachable at a throughput where you need a dedicated full-time employee to feed that processor with large size prints. Not even most labs can fulfil that condition.
For photographer use (which tends to be casual or batch-wise), drum processors (e.g. Jobo ATL, Colenta) are the only economic and reliable solution for large colour print development. Or you might want to consider ink prints.
