Sought-effective alternative to the original for Oral-B Slim

Since the Oral-B essays are quite expensive, I was looking for a replacement, also in regard to overnight guests.
The toothbrushes are actually very good, the fit is not quite as good as the originals, by a little more water comes under the head, you should always wash.
The bristles appear to be somewhat softer, but that should run on a matter of taste.

Delivery was very quick and packaged appropriately.