With Rebuilt toner can be lucky and you can have bad luck, especially if it is as in the case of the toner for Samsung ML-2851ND my is a toner, in which equal the drum is still installed.
In any case, I was lucky! The typeface is properly without vertical stripes, spots or otherwise any impairments.
If the toner or the built-in drum making prematurely limp, I would update this review.