It’s not, in my opinion. I bought one thinking it’d be better, but was disappointed in the inaccurate gauge. Got an AS2 Pro and it’s smaller, feels more solid, and is +/-1psi as advertised. Maybe the prestaflator will pump for longer, but that’s not my use case for one of these.
Does this charge with a USB-C or Micro USB cable?
Sure not faulty? The reviews have them as just as accurate but more inflations for similar weight.
The pump has to have an air inlet somewhere. Several brands use the USB-C port as the air intake. So there’s a direct path for water to contact the electrical circuits. If your pump came with a plastic bag to keep it dry, use it.
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I’d say it’s faulty, but I don’t know at what level (design, bad batch of sensors?) They curiously don’t list an accuracy spec on the website, just that it’s ‘precise.’
An MTBR member tested multiple of the little pumps and found a similar offset that I’m seeing. I’ve exchanged a couple emails with Prestacycle, so we’ll see what happens but I’m not expecting much. I like their chucks and compressor inflator tool.
I haven’t seen any other reviews with real pressure tests, but I know Dave Rome is working a new roundup for Escape that I’m sure will have lots of data.
When you do hear back I’d like to hear the upshot. I’m on the fence at the moment.
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USB - C
It’s so good. 5 year warranty ..
Just received a AS2 Pro Tiny E-Pump For Bike – CYCPLUS for my wife, much easier than CO2 / mini-pump and ideal when combined with tubeless and some Dynaplugs.
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Similar experience here - I got it for my partner as she travels a few times each year to race, and keeps buying/throwing away CO2s for every trip. This way she doesn’t even need to bring the foot pump (we’ve a portable one), or waste $10+ on CO2 that inevitable don’t get used. Plus, she’s a lot more comfortable with the AS2, you can screw up a CO2 and waste it, where the pump is quite forgiving and easy to use.
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Exactly, just makes sense.
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Unfortunately it didn’t make sense until she stopped to think, and realized between the two of us, we probably wasted $200 on CO2s and never used a single one 
I’ll still get CO2s for race situations, but otherwise 
I initially bought the larger cycplus pump that’s not something you carry in your jersey pocket but it works really well and I just use it for pumping up my tires before rides and it lasts a long time. Since I liked that so much I bought the mini so I could take it on rides with me.
What is the current recommendation for a pump that you can put in your jersey pocket? I think the Cyclami A2S has a good price and looks usable in the pictures
The Topump TB2 Pro is currently very very cheap on ali and is the same as the flextail tiny pro.
I suspect it isn’t QUITE as fantastic as a prestaflator or AS2, but I just got it for like 20usd.
I’ve had the Fumpa Nano pump for 4 years now. Still going strong after countless of rides in wet conditions.
It even survived a wash in the washing maching. I had it in my jersey pocket after a wet ride and when I got home i forgot to empty the pockets and it just went in the washer.
Zero problems still.
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The A2S is great. My first and only experience so far but very satisfied in its performance. Really like the ability to set pressure and have it stop automatically. Battery life is adequate for at least 3 inflations on a 28c tire. Used it 5 times now on self and friends, been very good all witnessing it were impressed.
While these are all obviously made in China, I don’t really get the temptation to buy the knock-off versions from Aliexpress vs some of the established ones on Amazon that have 1000+ reviews.
IMO it’s not worth saving 50 bucks to roll the dice on Aliexpress for something that could leave you stranded if it doesn’t work.