I was thinking about that, too. How do you transport the chairs? I am worried lifting in and out of the car will cause more injury.
The zoomer is really easy to transport. We separate the bottom wheel/motor from the chair itself. The chair itself is really light, not much different than a beach chair, but it is bulkier than we would have thought.
The motor/wheels is quite heavy, there’s 2 handles that allows us to lift it. We leave the battery in but you can take that out as well. It’s maybe 200lbs in total and easier to handle than our luggage.
When it’s all one piece, that’s a different story. While possible, I disliked trying to drag it behind us. Lifting it all as one piece was also unwieldy.

That’s where we liked the ATTO. Especially since I don’t need it normally, it’s easy to put into trolly mode and walk through the airport, wheeling it out to the car or to the hotel room.

However, both pieces are heavy and more difficult to handle than the zoomer. It does separate into two lighter pieces, that makes it easier to move, but I wouldn’t call it luggable. I almost preferred it as one puce fully folded up like a carry on. While heavier the handles made it easier to get in and out of the car.
Some size perspective with it separated:

In terms of comfort, the zoomer is more comfortable. In terms of ergonomics, the ATTO offers more intuitive controls. Both are good devices and I haven’t been able to decide between the two right now.
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