They work
Not an original Oral B brush but these work just fine and allow me to save a little.  I don’t have any problems with them getting loose on my brush.  They fit both my rechargeable brush and my kids battery powered brushes.  Sometimes my tongue gets in the way and it will get pinched ever so slightly, but I can’t say that that doesn’t happen with the original Oral B brush heads.
Rating: 4 stars