I give the Shark Rocket Ultralite two thumbs up.
I got the Blue Rocket at Woodstock Walmart on Saturday. As advertised, $149.00. (versus $549 for the Dyson). As lovely as the Dyson is battery runtime is abysmally low.
I like it a lot. With my somewhat limited strength these days it's the perfect daily run-a-bout downstairs & upstairs. Does a fine job collecting cat hair. Felix is a humongous longhair black Himalayan, shedding knitting-quality down daily. Not a problem on the leather furniture but all over the carpets & duvet where he lounges & preens. I have no other Power Nozzle that gets so much cat fuzz in one pass. Naturally, the brushroll gathers combed mats of fur in its bristles, which I expected, but they are easy to peel off, in return for the light weight and handvac configuration which is ideal for stair treads and the Duvet.
As expected the motor filter blackens with carbon dust but then, this is a brand new motor, so I removed the filter medium for it's first month of use.
It does collect a fair amount of fine fine dust on the foam filter but that's easy to shake out like a blackboard brush. Wash it every month. As for replacements, I'll cut my own from sheet foam.
Not a whole-house vacuum but it may be just the right & economical multi-surface thing for seniors in small apartments & trailers.