portable vacuums with good suction
There are several portable cleaners that have good suction and airflow, both are important. The Numatic Henry, any Sebo cleaner, Miele cleaners are also really good. That's one major down side to the dirty air cleaners, they have good airflow but their water lift is lacking. That's one big advantage of the clean air uprights and any cleaner that requires a hose such as a canister, backpack or central vacuum. Also, with the dirty air machines, anything you pick up goes through the fan, so you have to be very careful what you are cleaning. More than likely, if you vacuum up something sharp or metal screws, it will break the fan.
I enjoyed the review, I'm not an upright person anyway but Kirby is definitely behind the times with their design. You should not have to still be changing a belt with a 2020 vacuum. And what you have to do to switch to hose mode is far too difficult.
Mike