I bought it in 2014 and today, 10 whole years later, it gave up the ghost. It charged electronic cigarette batteries daily (18650, 20700 and 21700 mainly) while for the last 4 years I didn't even take it out of the socket except when I went on vacation and took it with me. I had bought it from a Chinese store (internet) at a slightly better price than the then Greek standards, of course it paid off its money here for years! Today all the indications on the screen went out (only the backlight remained on) and of course there was no possibility for any charger operation. It's gone in short. Surprisingly, while I was looking for solutions on the internet to repair it myself, I found several people who faced the same problem with just a few months of use. In mine, for 10 years, I didn't even need to change the fan, it still worked almost silently until today. I was sorry to part with it, because habits changed with the electronic cigarette, so I got a much cheaper one to do my job. Opus, however, proved to be a tough guy in my hands. I wish those who wish to acquire it by looking for opinions on skroutz.. ;)

I am not an expert in electronics, and the following are my impressions after the first use on 4 Eneloop (2 AA & 2 AAA):
First, I completely discharged them: the AA ones that were half-finished at 700mA, and the AAA ones that had minimal charge at 500mA.
Then I charged them: one AA at 200mA and the others at 500mA. The fan turned on once for a very short time, but when I touched it with my hand, I didn't feel anything warm. Also, the fan was quite quiet - something I was worried about. Each dock worked perfectly independently, and when it finished its job, it displayed a related indication.
One detail that bothered me a bit: when you select the mode, it is easy to confuse charge with charge - test. In both cases, it displays the same charge message, but in the second case, there is also a test indication a little further down. I made this mistake on the first use when I didn't know, but it is possible that I might do it again in the future if I am in a hurry and don't pay attention to the second 'test' indication. Then you go to take the charged battery and see that you waited for nothing.
Overall, I am very satisfied with the purchase and would recommend it. It seems quality and has a lot of features. However, time will tell.
UPDATE: after 6 months of use, it continues to work perfectly, and I haven't had any issues. Very satisfied with the purchase so far.

Unbelievable product.
Anyone who wants to properly charge their batteries should learn about the battery's health and related information (such as performing tests to see how long they charge, but also fully discharging them to see the battery's condition and lifespan). They should get it without a second thought.

It has a fan that has been working perfectly for 1.5 years and dissipates heat when it is under high mah charging (because you can adjust to charge at different levels for each battery).

By far the best product compared to others on the market, even at the same price or higher (and I am also referring to "branded" battery chargers that approximately depict and depend on the type of batteries you use, for example, if they are their own brand or not, cough cough, I don't mention any specific company).

Anyone who wants a more economical option, around 20-25 euros, should know that they will damage their batteries in the long run and will not have accurate measurements since they will not charge properly. Of course, you get what you pay for. Personally, in the past, I have spent at least 70 euros on 3 battery chargers from other companies, and within 1.5 years, they had all failed.

The only disadvantage, as mentioned, is that it does not have a Greek manual with instructions, but there are plenty of videos on YouTube that explain them.

But in the end, it's all a choice. You can go for a proper product that will last you at least 5-10 years or a cheap solution that lasts only 1 year, if that.

Your money, your choice. Ultimately.