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I have it for 3 weeks and I am thrilled. After the Michelin compressor which (despite being equally expensive) personally disappointed me, this one confirmed my expectations.

a) Firstly, it inflates the tire much faster.

b) It is a clip-on and not a screw-on valve, but don't worry. It attaches very well and its measurements are very accurate (checked both by the car's tire pressure measurement system and by the tire changer's gauges that I use to change tires). It also saves you time since you don't need to screw and unscrew all the time if you want to inflate 4 or more tires. Just one click and you're ready. You adjust the pressure where you want it and let it do its job.

c) It can be powered in 3 ways! Either from the car's cigarette lighter, from a household socket (important if you don't want to drain the car's battery), or from an external battery that you buy separately.

d) It is of excellent quality, with spaces for the cables and its accessories.

e) I would say that its price is high. However, considering its main competitor that has a similar price, the B&D is faster, more accurate, and has more functions. So I would say that it is worth its money. If it also proves to be reliable (I will update the comment after a few months of use), then it is a one-way street.

I have had it for 4 months.

The positives are that you can choose the pressure you want it to reach and let it do its job. Also, you can set the pressure in bar, kpa, and psi. It has 5 small LEDs on the front that are quite useful if there is not enough lighting when you use it. The construction is made of plastic. You can't say it's bad, but it's not perfect either. All the cables (power and air) fold and are placed inside the main body.

Now for the negatives...

1) It is placed on the threaded valve of the tire, which is a bit tiring if you want to check the pressure on tires of 2 cars (let alone more). Thinking at the time of purchase that it was probably for accuracy reasons, I decided to overlook it (wrongly, as you will read later).

2) It does not take power from a regular household socket, only from the car's cigarette lighter.

3) It seemed inaccurate to me at first because my car has a tire pressure sensor and the measurements always differed by 0.1 bar, and sometimes by 0.2 bar. I checked it for verification with the professional machine they have at the tire shop where I change tires, and it confirmed my claim of inaccuracy. I thought it was just my machine, based on what I read in the comments, so I chose not to write a comment then. A friend of mine has had it for a month now, and I had the opportunity to check his as well. Same thing. It differs by 0.1 bar compared to the car's measurements and the tire shop's measurements. (Also, neither of the two machines does a start-stop on the motor when inflating the tire. And the same behavior is exhibited by machines and other users online. So, it does it for some and not for others. Different programming per device?) And okay, the 0.1 that it falls short of is not something tragic if you look at it individually. But if you think that it costs 70 euros and bears the name Michelin on it, then...

4) Therefore, the 70€ it asks for are quite judged. It is neither extremely powerful nor as accurate as it should be for this price.

In conclusion, it is not a bad machine, but for its price, it does not do what it promises perfectly. If we even look at the competition, at this price (9 euros more at the moment I am writing this comment), there is the Black & Decker BDCINF18N-QS, which takes power from a regular socket, has more functions (can add and remove air), is more powerful, and is attached to the tire valve by a clip, so you don't have to screw and unscrew it by hand. In fact, when I was shopping, it was on sale for 5 euros less than the Michelin (at a large electronics chain), and I made a mistake not choosing it and trusting the name Michelin. So, the assessment is minus 1 star for the price compared to the capabilities and another minus 1 because it should have been very accurate due to its name.

Update 20/03/2020:
I have had the B&D compressor that I mentioned above in my comment for 20 days now. Unfortunately, it confirmed my claims about the inaccuracy in the pressure measurement that the Michelin does. The B&D measures exactly what the car's system and the tire shop's pressure gauges measure. At the same time, I inflated the Michelin to 2.4 bar for the front and 2.8 bar for the rear tires. Then I connected the B&D, which gave the following values: 2.2 + 2.3 for the front and 2.9 + 2.7 for the rear. Going out with the car to see what the sensor will measure after resetting it and driving for about 2 minutes, it gave the following values: 2.2+2.3 and 2.8+2.7.
The next day, I went to the vulcanizer (about 10 minutes away). By the time I got there, the car's system stabilized (because it constantly measures as the wheels turn) at the values that the B&D initially measured, namely 2.2+2.3 and 2.9+2.7. Both the analog and digital meters showed the same values at the vulcanizer.
Wanting to dispel any doubts and having both compressors with me, I tried to measure pressures (I didn't inflate as they had already been inflated) on another car that was there and had just had its tires changed.
And this test confirmed the measurements of the B&D.
After all this, I don't bother anymore because things are clear to me now.
Last 2 comments. Comparatively again, a) the Michelin is slower and b) it heats up faster (with all that implies for the engine's longevity).