“Not only do the bagless models have more power, but they will also save you quite a few trips to the store and the closet…”
Well maybe that holds true in the U.S, but these days in Europe and UK with the new EU law limiting vacuum cleaner power, I can't say that I would change over automatically to bagless with newer lower energy efficient motors. In my experience, some of the new models with claimed lower motors are rubbish compared to the stronger, longer bands of power from old.
It isn’t the actual lower motors that are fault though but the brands who have made design adjustments to the soleplate for increased suction that often doesn’t consider the owner who has to push a much heavier upright across a carpet.
As for saving oneself “a few trips to the store,” well, that hasn’t actually been proved. I doubt bagless vacs save many people going to the store given the amount I see on a weekly basis dumped at recycling sites. They’re not saving anything for a family who buy a cheap bagless vac, only to dump it a few weeks/months later given on the cheap cost prices of some models as well as parts that are far too difficult to clean out, in order to last longer.