I have refilled the original Brother starter toner cartridge eight times without any problem. The first time requires a counter gear to be installed, which converts it into a TN-450 cartridge. (Alternatively, you can use the secret button sequence.) After that, each refill costs about $5 for a bottle of toner. BTW, do the refilling outside.
This $65 HL-2240 printer has been completely trouble-free for four years. I also like that the drum and fuser are replaceable.
