I just received it so I decided to share some first impressions.
Very good packaging with USB cables and car lighter connection included.
You can inflate anything from balls and boats to motorcycle and car tires.
Before first use, I decided to try charging via USB, it works fine although the battery was already charged, just so you know the cable gets a bit warm near the port.
As for the operation, everything is fine. I tried to inflate a car tire that was at 1 bar and I chose to bring it up to 2 bar.
The pump did its job perfectly, it took a few minutes, about three to five, I didn't use a stopwatch.
Obviously, it can go even higher which of course will take a few more minutes but we're talking about a negligible amount of time.
It makes a bit of noise during operation but nothing serious.
For someone like me who will use it occasionally, it is an excellent choice.
I would definitely recommend it.
Remains to be seen how it holds up after a few months.

Very powerful pump, large battery, relatively accurate indication.
It remains to be seen how long it lasts over time.
Other than that, it's worth it

Very good.

I was really impressed: 4 tires 225/45 R17 from 2.1 to 2.5 bar in 35 sec for each tire and the battery didn't lose a single bar.

After 2.5 months of staying in the trunk, I used it and inflated completely empty Jeep tire sized 245 with 35 psi in about 10 minutes. Even though it was 1 in the morning, it didn't make a loud noise to bother! I have another bulky one (battery starter and compressor) that sounds a lot.. It is convenient, effective, and lightweight. I chose the category for Jeep, aimed for 35 psi, easily attached the air hose to the tire, and everything happened automatically and easily. The 2 amp battery had 4 bars just like before! The only reservation I have, as with all rechargeable batteries, is the durability of the battery. Time will tell. (Of course, charging every quarter..)