"Star Wars the old republic, experience a wide world full of possibilities online!"
but one thing that bothers me is, what are the pros and cons here?
The game has nice quality, seems to be legit and maybe better than its prequels.
but Im not sure if I should buy it because it costs you about 12€ (in my country) per month.

can you help me decide?

the problem i had with swtor was that 1-10 was absolutely amazing, great and engaging, but then you get past level 10 and it just becomes the most horrible grinding session ever. i only got to level 25 before i cancelled my subscription, it's definitely worth checking out but i found it to just be plain boring after a while.

I had a really bad experience, because the gameplay is pretty browser-intensive, and my internet is slow as hell, so 'instant' attacks took me around five seconds to use.