I have a samsung laser printer as well. It costs me an arm and a leg when I do have to replace the cartridges in it, but I can print a ridiculous amount off of one toner cartridge so it actually comes out cheaper.
Because of our dealership I print HUGE amounts of paperwork. I've been using this for about 3 or 4 years now and it's a dream.
I think we only paid about $200-$250 for it. I didn't want to spend an arm and a leg, but I wanted something that would work a whole lot better than an ink jet.
It's been well worth the minimal investment we dished out on it.
I've heard people say Samsung has a page counter in there somewhere to automatically reject a toner cartridge as empty at 2000 pages, but I have been able to take the cartridge out, shake it up and make it print until it really does run out and print like crap. I do not have to replace the color cartridges if the black goes-I go through a LOT more black than color.