Why not just use a pump?

Are you talking about the portable ones for inflating tires away from home after a flat?

I've used one, I had a flat and was reaching for my co2 cartridge when someone handed over their pump instead. It seemed to work fine, and I liked that they could set the target pressure. I would use a floor pump or air compressor at home, though.

Yes, got a Cyclami from Ali. It's very well made and I've been uaing it for inflation and topping up my tires for three months now.

I use my Xiaomi inflator on my Honda motorbike. Can be used in motorcycles, bicycles, it has an setting/adapter for basketball/football balls, and in theory it can go for car tires too, although i reckon it would take forever. And it IS noisy, yeah. Bought it about 4 years ago, still trucking like the first, and had saved me having a flat on the road, being able to pump to ride to a safe location to get it sorted.

I bought a fumpa and it had issues immediately. I could only inflate for a few psi before it would fail. Had to plug it back in to power to reset the pump. Told them the same information and they wanted to send me a new one. I have given up on the experiment. I rarely need them on the road. Carry emergency CO2 only. I fill before each ride to maintain accurate psi levels. Tubeless on all my bikes. They seemed perplexed (fumpa) that anything had every failed. I just wanted my money back and they were pretty pushy before they relented. I wouldn't buy another one of those and Amazon seems littered with trash versions. I went with fumpa as it was made in America. Oh well. Maybe in a few more years they'll be more reliable. Super loud too. I have a Ryobi battery pump with digital gauge that you set desired psi. It was quieter than the fumpa and use that before every ride.