I purchased this as I was the benefactor of another rider using their Eflator for me after a flat and 2 Co2 inflator failures. It is fast, easy to use and a lot easier than pumping. My only issue is the size and weight to carry in my jersey for "just in case" flats. I'm glad I bought it.
I bought this item to travel with my bike. I did not want to bring my floor pump with me. The e-flator fits easily in my luggage. Relatively easy to use, read the directions for best results when inflating road tire. The adapter piece isn't intuitive to use, you need to screw it on to the tire valve first. Then attach it to the e-flator and hold it on with pressure to the valve stem as there is no locking mechanism like a floor pump has. Just an FYI the little pump is noisy.
I want this product to work. I have tried several times. The problem is screwing the presta adapter on wheels with valve extensions. I screw the presta adapter on to the valve extension. Then screw the pump on to the extension. I set my pressure on the pump. Press the start button. The pressure goes up to 30 pounds. I want 55 pounds in my rear tire. It gets to to 30 pounds, keeps making noise, put the pressure goes no higher. On my 80 mm deep wheels, it doesn't put any air in the tire. I wanted a pump that accurately puts in pressure. This just isn't doing for me.
This is SO much easier than using a mini pump to bring tire repairs up to the 115 psi I ride, and will be cheaper in the long run than Co2! A little weighty, but it fits right in with all the T1D backup carbs and other gear I carry.
A precision tool should come with a precise adapter. The screw on presta value adapter does not work well allowing air to escape. The purchase of a quick release adapter solved that issue.