An educational week

I've already shared my impressions about the TopCoder Open 2015 Semifinal and Final rounds; however, this week had another noteworthy event:

Educational Codeforces Round 1 has tried to realize the "only solutions that can truly handle all possible cases should score points" aspiration by allowing 24 hours of challenges, including the ability to stress-test, after the round has ended (problems, results, top 5 on the left, experiment description, experiment analysis). I haven't been participating myself, but from the surrounding blogs it looks like the experiment was quite successful, with many contestants contributing tricky testcases after the round has ended. What are your impressions from this format?

Thanks for reading, and check back next week!