It is personal impression
I used eco before
I felt that the printing was thick and the reduction of toner was quick.
Genuine products can be used with confidence.
If you use recycled toner from other manufacturers, black dots and lines will come out, but as it is still genuine products it is safe because there is no such thing.
Although it is totally personal impression, I think that the genuine toner cartridge is the best, after all. Although it does not deny the refillable compatible toner cartridge, considering the printing quality, the life, the price, the frequency of refilling, ..., etc., it seems that the genuine toner cartridges are going to rise. I think that it will be several ten repeats, but I will certainly buy the same genuine toner cartridge next.