Well, I tried good old #3 with the bag and so far so good. It picks up much better than the bagless ones and isn't clogging, etc. Having only used it a few times, it is too soon to know if it will stand the test of time. I am keeping the receipt in a safe place just in case. At this rate, I will just keep trading them in every 3 months and will always have a new one.

Uki