Keith,
Also if you don't know this....there are carbon filters that fit down the bag recess to the bottom on the 1205 onward. They are supposed to help with the bag content smell, but they also work as a secondary filter before the motor. Someone said they are washable too.
If I had the room, I'd keep buying Diamond J's. They seem to be plentiful and I can restore one easily in an afternoon, in normal used condition.
Kevin