I like the examples at the Go Playground.
Ideone uses gc-2010-07-14 so it seems to be quite ancient but ok - it is not the up to data version, but I really do not get your comment about speed (do you mean the execution time, response time or what?) and the indent feature (It seems to me there is no auto indent feature and the "Tab" key moves you to the examples list).
There's a bug in the interface code for non-Chrome browsers. In Chrome, the tab key works, and the text area auto-indents. It's a small comfort but it makes a world of difference for me.
There have been language changes as recently as this week. Go moves fast (although it's unusual for existing code to break).
Also, it's running a _really_ old version of Go. (http://ideone.com/spBzw) It's at least 400 revisions out of date. We intend to keep the golang.org Playground up-to-date.