That flow through bin is great, I sent that exact video to my friend yesterday.
So many of the DIY flow through bins have troubles, that one is by far the best.
I am not convinced that either the vertical or the flow through are less work than a horizontal though, but probably faster.
If you wait the 2 months for all of the worms to migrate, there is no lighting tricks needed, and no worm separation.
When compared to vertical, there are no trays to deal with, and higher volume.
When the designer of that flow through critiques his design, he talks about durability issues, and using pressure treated wood instead.
The PT wood may be fine for the worms, but what about the microbial life, which is really what we are after here, and that PT wood is designed to kill?
A simple horizontal system like the one in the video I linked, has a liner and the bin will last a long time.
If one had volume and needed it done fast, I think the flow through design is hard to beat, but for passive home use I think horizontal migration is the way to go.
For high turnover, active production, THIS is what ya really want, or some DIY design that has a motorized harvest.
