I have seasonal allergies that can sometimes cause asthma attacks. It’s not bad enough to require daily medication, but I needed a way to take albuteral when it acts up. I used to have a big unit, but it was kind of a hassle to deal with. It was too big and too heavy for me to manage on my own. This is completely different. It’s small enough to fit in a small purse so you can use it on the go. It’s nice and sturdy, but still lightweight. It includes a choice of masks so it can be used on adults and kids. Even if you don’t have asthma, it’s a good idea to have one on hand for upper respiratory infections, too. The battery life is great and I love that it is wireless.