Work, good value, but somewhat on the softside
I am comparing it to my kids Oral B original brush head.  First of all, it's compatible, but as you can see from the picture, the brush head is a little bigger then the kids version, and if comparing with the regular adult version, it's slightly smaller.  Comparing to the original Oral-B brand brush head, it's a little on the soft side, and if looking closely, the brush looks not as good as the original one.  When using it, it feels almost no difference.  However, how good it's to your teeth comparing to the original one, that's not something I can tell, so I will leave it to the dentist, but I don't think it does as good since it's soft and, when brand new, it brush tip looks so spread out (almost like what the original one will look like after a month or two of usage).  The price is the best thing, it's like a fraction of what the original one cost, the question is how often you need to change it, it maybe be as cheap as it looks if you have to change it much more frequently.
Rating: 3 stars