At 35€, it's the only budget option worth getting for a wireless mouse under 50€. The next best option is the Razer Orochi V2. It's also featured here: https://youtu.be/yfStwwBFCEw
Initially, the battery is a bit unacceptable for a battery that needs to be replaced every time it runs out. HOWEVER, this is not the mouse's fault. It's the battery that comes with the mouse. I recommend anyone who gets this to also get a lithium AA or AAA battery (which can be combined with an adapter to make it AA size) and it will be perfect.
I like the build quality of this mouse more than the much more expensive G PRO Superlight, especially the surface.
I don't like the weight of it with the AA, not because it's heavy in general, but because the weight is distributed incorrectly where the battery is. I prefer to use it with an AAA battery, as the problem (maybe just my preference) is reduced quite a bit that way.
While its wireless is incredibly clean like all Logitech and Razer wireless products I use, I easily experience interference from Wi-Fi, other USB devices, or even reasons I haven't figured out yet. According to what I've found on Reddit, others have this issue too. Of course, this doesn't make the wireless bad, as it may occur in certain situations. I didn't have any interference issues with the G PRO.
The clicks have a nice feel, not too light and not too hard, and their travel distance is fine. I haven't had any double-clicking issues like with the G Pro.
The big negative for me, which if we weren't talking about a 35€ mouse, would give it endless stars, is the mouse feet. Logitech isn't generally known for its mouse feet, even in its new mice (except for the G303 Shroud), but these are overly thin and small, making them incredibly quirky about what mousepad I can use and even when I use the 'perfect' mousepad for it, I feel like they're scratching on the mousepad. I recommend changing the mouse feet 100% to anyone who wants to keep the mouse.
Finally, while it suits many, it didn't take me too long to get used to it, and even after I did, I still felt like it didn't fit me. Of course, I've received positive feedback from several people with small palms and few negatives, so I guess if you have small palms, you'll accept it!
Overall, the mouse is fine for its 35€ price tag! But as I said, the must-change things for me are: the battery to be lithium, either AA or AAA. If you go for the latter, also buy an adapter. PTFE mouse feet like Corepad, for example.
If you have a medium palm and want an economical wireless mouse, I might recommend the Razer Orochi V2. It's quite close to the 305's philosophy, but personally, I consider it superior in shape, lighter, PTFE mouse feet, better switches, but it costs 20€ more.