there is no "visa hassle" if you come from Europe, and there are no trip cost since the company pays for everything. While the sessions are available as video

there is no "visa hassle" if you come from Europe, and there are no trip cost since the company pays for everything. While the sessions are available as video streams, the sessions and discussions in between the sessions are not. I was at I/O last year and I not only had a good time, I also learned a lot during the three days.