It was purchased for €47.78 (with free shipping) and I am very satisfied with the device. I have had it for a short time, so I do not have an opinion on its durability (my previous blood pressure monitor, an AEG one with good reviews and slightly cheaper, lasted 4 years before "giving up"). However, it seems well-made and sturdy, from a Swiss company (with a good reputation in medical devices) and probably manufactured in Poland (not clearly indicated on the device or its packaging). As for the accuracy of the measurements, I also do not have a complete opinion. However, in two (triple) measurements I made (the second measurement 2 minutes after completing the first), the results were almost identical (+3 mm Hg in systolic pressure during the second measurement, while diastolic pressure and pulse were exactly the same). However, I did not compare it with a professional blood pressure monitor. It seems accurate, but I do not know to what degree of accuracy it reaches. According to their own measurements and official certifications, its accuracy reaches +/- 3mm Hg, which (if true) classifies it as a relatively high-accuracy blood pressure monitor. From the reviews I read online, it seems to be quite reliable (which is why I chose it).
The positives that I have also noticed are: 1) I don't know how they managed it, but the cuff of the blood pressure monitor is very "soft" and comfortable when inflating, it "presses" your arm minimally. It probably has a highly sensitive receiver, so it does not need to inflate excessively to detect a clear sound signal/pulse in order to proceed with the measurement. It is completely different from my previous blood pressure monitor, where there were times when I felt that the blood flow in my arm would be interrupted due to excessive inflation. 2) It has the option for triple measurement, where each individual measurement starts automatically after the completion of the previous measurement, with a 15-second pause each time (to avoid excessive pressure on the arm). If the device considers any of the 3 measurements to be less accurate (due to a significant deviation compared to the other 2), it automatically rejects it and proceeds to a 4th measurement (it always warns you with a countdown for the start of each subsequent measurement). You only see the final result and not the individual measurements. This function (multiple measurements) makes the measurement more accurate, but if you prefer, you can choose the simple mode (only one measurement is taken). 3) Apart from common arrhythmias, it has the ability to detect the presence of atrial fibrillation (with a success rate of 97%, as certified by the manufacturer), which is one of the most dangerous forms of arrhythmia and quite common, especially in elderly individuals. In case of detecting atrial fibrillation, there is a separate indication on the blood pressure monitor (compared to the one for other arrhythmias). 4) In the packaging, besides the batteries and the case, a power adapter is also included (to operate the device with electricity). However, I do not know if this applies to all batches or only to those that were (probably) manufactured in Poland, so clarify this before making the purchase. In my case, the package had on its front side, apart from a photo of the blood pressure monitor and a separate (small) photo of the power supply, which it actually included. When the device is used with the power supply, even if there are batteries inside, it does not consume them. 5) It has the ability to operate with rechargeable batteries (NiMh), with the limitation that they should be removed if the device will not be used for more than 1 week, 6) There is a warning indication if the cuff is not properly positioned, 7) There is the option to delete a measurement from the memory, which is useful if, for example, you want to measure someone else's blood pressure but do not want to alter the average of your own stored measurements (which is displayed first when you press the memory button). However, the deletion of a measurement from the memory must be done immediately after that specific measurement (it cannot be done afterwards), 8) When you remove the batteries (e.g. for replacement), although the date/time needs to be reset, the stored measurements in the memory (the last 90) are not lost, 9) The cuff in the package is size M-L (22-42cm), covering almost all individuals, except for small children and individuals with excessively large arms, 10) The device has a 5-year warranty (except for the cuff, which has a 2-year warranty), while most low and medium-priced blood pressure monitors have a 2-year warranty.
The only negative thing that I have found so far is that the user manual included in the package is in Polish and English. However, with minimal searching on the internet, I easily downloaded (from the company's official website) the Greek user manual, which is comprehensive and detailed.