First of all, let me say that I am an amateur musician (not a professional), so I may not be able to provide a more detailed evaluation of the pros and cons of the card. I might unfairly judge the card due to my lack of knowledge. Let's continue.
I wanted to mention why I wanted this particular card and why I ultimately chose it instead of spending an extra 40 euros for the equivalent Focusrite (which costs around 95-100 euros in Greece). I mainly wanted the MIDI outputs because that is their main difference (at least on paper). Now, I am not the right person to say more about the Midas Preamps of Behringer, whether they are a gimmick or not.
Anyway, I wanted a sound interface to connect my electric guitar and play metal with my plugins, etc. Just simple things, to record some riffs, that's the extent of my knowledge.
One negative aspect I noticed and consider a downside is the documentation. Not only is it insufficient, but it is so incomplete that it doesn't mention any numbers regarding what the card can deliver, its general limitations, like all other serious manufacturers do. You basically have to blindly roll the dice...
However, you can find this information from more experienced sound engineers on the internet who have figured it out and shared these numbers.
Now, let's get to the main negative aspect, which is the reason for giving it 4 stars instead of 5, even though the build quality is very good and the sound is as desired, etc. Drivers... I believe this is the Achilles' heel of this product. Even before the 204HD came out, Behringer didn't provide its own driver, but instead directed you to download ASIO4all, which is essentially a third-party generic driver that can be installed for all sound interfaces. *There is even a relevant video on YouTube that shows Behringer didn't even have its own site back then to provide the drivers. So, you had to download third-party drivers from third-party sources. Now, they have their own domain and provide their own drivers.
To keep it short, I had glitches (cut-offs) with their drivers in various plugins I tried. I tested ASIO4ALL and had issues with some plugins, while others worked fine. But it clearly performed better than the UMC driver from the same company. Madness...
After many attempts and thinking, I decided to download the previous version of the UMC driver (version 5 instead of 5.12) and the problem was solved. I did notice that the output levels and everything that came out of my monitors were reduced compared to before, but I didn't have any sound cut-offs, so everything was fine. All of this was done on Windows 10, by the way. I don't have anything else to try, like a Mac or an older version of Windows, in any case.
In general, this has been my experience so far. The issue with the drivers is something that might potentially deter someone, as for me, the issue was resolved in the way I described, but for another user, for example, I can't guarantee that everything will be fine regarding the card's software.
If someone asks me now if I would recommend it, I read that even Focusrite sometimes has crashes and driver issues, so what can I say to someone? Should they just go for the most popular entry-level sound card?
That's it.
Update: It turns out that the issue I had with the "cut-offs" or "glitches" was from my system and not from the drivers or the card itself. I had to change the Power Plan/Management in Windows to High or Ultimate Performance from Balanced that I had it. Everything is fine.