I am giving this 5 stars knowing for my specific use-case of this product and how I use it. I can see lots of people being disappointed if they don't set their expectations of what this is... A mobile, battery powered air compressor. For me, I absolutely love this Smartpump as a mobile air compressor.

Now granted, many people who cycle use a C02 and air chuck. It is fast, but you also can't fly with C02 which means you have to find a C02 at your destination and those add up quickly in terms of cost. You also get one shot at the C02 and don't have any feedback to the PSI you are actually putting in. C02 also bleeds from the tubes quickly. Hand-pumps don't usually give you feedback from PSI, and while it will last as long as the seals of the hand-pump last, you will find that hand-pumping tires in the field is an annoying task which quickly gets old.

Gotchas
- If you are a US user then you are probably familiar with PSI so make sure you have it set PSI and not KPA
- You need a good seal like all pumps and this is a Schrader (fat, short) valve by design, that comes with an adapter of the Presta (skinny, long). I use a specific high-quality pump handle that is meant to pump up things like disc wheels and it works fantastic in conjunction with this product.
- I like to set it up, press the start button and just walk away. It will stop when it is done.

Things I didn't test/limitations
- I didn't test Schrader valve pumping / nor stock Presta valve pumping (I used my own pump head)

I recently purchased a Specialized Sirrus Pro Carbon so I bought this pump as I thought might as well. This pump is just pure awesome! So freaking easy.

Ok I realize that it's pouring air into a tire and that's always easy really... But even still. You turn it on. Pick the unit (psi, etc), then select the pressure. That's it... Then I attach to tire with the easy lock on and press start. Wham! It instantly tells me my tire is at 27psi. That's 3 points low my friends. With one more click the unit immediately begins to fill my tire... And with a lot less noise than I expected to be honest. Within seconds the gauge climbed to 30 psi...and...wait for it...yup it stopped on its own. Simple.

I just stood there waiting for it to finish like a boss. Ok that's a bit excessive but you get the point. Easy.

I've been looking for a electric air compressor for a long time now. This is my second pump, the first one was a mini portable air compressor but soon it broke. This one is easy to use and small enough. I can't speak for the use on vehicles however, this pump fits my bike well. For a test, I pumped my bike tire from 0 psi to 120 psi within 2 minutes. That's really fast mini pump. And the body and the air hose will be a little hot when it's working but it's acceptable.

It comes with 4 different nozzles for different purposes. I test it on basketball, the inflation is easy and fast. There is no need to keep paying attention to it, it stopped automatically when pressure reached the target.
There is no issues so far. I will update this review if I surfer any issues

This is a game changer for me. I ride a couple of times a week and alternate between my ElliptiGO and my road bike. I always pump up before I go. This pump is extremely portable and worked like a champ. I rode with a group the other day and everyone loved how easy it was to top off their pressure yet still have reserve power for flat repairs.

I also teach group fitness classes at several locations. This pump is fantastic for pumping up fitness balls and the power bank is a great backup for my phone and sound systems. I also tried it on my car tire, and as a woman, this made things a lot easier! It's a keeper for me and has found a home in my gym bag when I'm not riding.

Very efficient and easy to use. I don't need to inflate my bike by my own, just set some parameters and click the start button, it will help me finish the job. Just several seconds my tires are back to life. In the setting menu, you can choose several units and don't have to convert by yourself. For example, one of my bikes use 'psi' and the other one use 'bar', I just choose different unit and set the pressure to the recommended value, this is very easy for me.

It can be charged by usb, so I can use a power bank to charge it, it is convenient when I want to go a long trip.

The most important, this air pump can reach to more than 120 psi, it suits to my Road Bike