My Janome 10000 is over 11 years old now - and uses any thread that is on the market, or is vintage (I thrift store alot).
It is a different story with my 2 year old viking sapphire 875 Q, picky little sucker. The bobbin area is plastic and poorly made and any bit of lint gives me an error message (remove thread from bobbin area or something like that).
Never again will I buy a viking. it has been in the shop 2 times for minor repairs (at $175 a pop). now a tiny blade has fallen off from one of those junky plastic rings that holds the bobbin in, don't know how to put it back. Run away from this machine.