Today i tried topcoder and the experience was just horrible.
First it was hard to figure out how/where to submit etc., not at all intuitive or beginner friendly
Couldn't submit my solution, "COPY BYTE error.." something like that.
Even vjudge could not submit.
Tried to download the arena applet, for that i didn't have the password, so tried creating new account but the one time verification email won't come.
The starting experience was just horrible.