Do you have this one?My yard is probably getting on for about 100m^2 and I would say it's just about OK for the MacAllister "corded blower/vac" I got from Screwfix. It actually does a pretty good job even on wet leaves and having them shredded is a bonus but I'm not sure it's much quicker overall than a rake/brush. And when you forget to do the zip up on the bag it gets messy But for £40 I am quite impressed, though it is a corded model.
On our lawn/paddock we try to use the tractor mower which has a powered collector. We get several inches deep leaves sometimes so it's a real job! I would LOVE a BillyGoat but they start from a grand for the entry level one
Mac Allister YT623105X 2800W 230-240V Corded Blower Vac | Blowers & Garden Vacs | Screwfix.com