BEWARE: Soft ... NOT Extra Soft
First and foremost, the brushes I received are marked "SOFT" not "Extra Soft" as product title says.  I received eight (8) brushes in two sealed packaged of four (4) each.  I actually like the fact that the OEM Oral-B brushes are all in individually sealed packaging when you buy them in bulk.  I just think the individual packaging lends itself to the brushes remaining sterile until they are ready to be used.  I did notice some difference in the overall quality of the brush heads in comparison to the OEM heads.  The description refers to flossing action bristles; but the OEM Oral-B actually have several rubber flossing bristles amongst the other bristles.  These replacement brushes do not have the specialized flossing bristles.  But, all in all, these brushes seem to do a good job of cleaning my teeth at a FRACTION of the OEM cost.  They fit my Oral-B toothbrush body well, they stay in place, and they agitate properly.  Although the quality is not identical, these brush heads are a VERY GOOD option for a budget-conscious household.
Rating: 4 stars