Rob - interesting info there regarding the HEPA filter on the bagless Starlyf - but I must say it isn't any different to the ones that AEG/Electrolux fit on their Ergorapido stick vacuums - in so far as the design of a tiny paper pleated cone filter with a slide out mesh filter on the outside of it.
TBH if the bagged upright version of the Starlyf still has that silly, permanently opened air exhaust grill at the back, there wouldn't be much of a difference to either.