I've been using the Brother PC-201 cartridges with my Brother IntelliFAX 1270 for several years with no problems whatsoever. The fax machine doesn't get nearly as much use as it once did thanks to e-mail, but the cartridge continues to work unaffected by time. My last one was in the machine for nearly 34 months and never gave me a problem. Easy to install, too -- just take it out of the box, remove a little cardboard item that keeps it from unrolling, and pop it in the machine. It may be dated technology, but it works!