I had a Brother black and white printer and had no issues using cloned toner. However, for a color laser I had, they eventually caused the printer to die. It was an accumulation of toner inside the printer that caused all sorts of printing problems. (In theory it’s cleanable, but it’s not easy to do and you have to do in the dark as you can’t expose the drum to light without ruining it.)
I now have a Brother color laser and I only buy genuine cartridges for that. Expensive, but I print very little (for anything in quantity it is cheaper/better to use a print service like Staples).