These rollers put together well enough, but they are very light. The rubber feet are also not all that sticky.
All this means that unless there is a secondary method to keep these from moving around, the force of the extruder pulling the filament can cause the rollers to slide around enough for the filament roll to fall off, especially if the filament roll becomes lighter due to filament running low (or tangled filament).
In my case, I have built a stop that keeps these rollers in place. This works well enough that I haven't had issues with 3.5kg or 1kg rolls falling off.
So, I would recommend these if you didn't want to make rollers from scratch but still have a way to keep them from sliding around, but if you just want something that would work out of the box they may disappoint.
Like it Wes. Can you share the photo of what you are using?