It’s not bad
I’ve used one of those converters, and the suction is pretty good. I used it around the house to pick up a lot of things I thought it would have issues with. It does bog down if you’re using it to clean up heavy dirt, like spilled kitty litter, but what machine doesn’t? It should be fairly good, but if you’re doing a lot of high-up cleaning, that’s a challenge because the hose usually doesn’t reach up to the ceiling.