I'm surprised more people are not posting about these. Maybe the product share is tiny. They appear to have many positives and a few negatives.
Eat kitchen waste like mad.
Have nice net cover so fruit flys stay in.
Easy harvest of vermicompost at the bottom.
No trays to shuffle, deal and reshuffle.
Worry about the stresses on hooks.
Cloth like material and worms together like nails on blackboard to me.
Not free like buckets.
Drys near edges.
Do not know how many years it would last.