[taylorbuley]

Look at history: The Digg v4 rewrite was catastrophic. Not in that it didn't work (it was quite elegant engineering wise e.g. Cassandra-powered Digg buttons) but in that it took a really long time and when it was finally ready it was already behind.

[Serplat]

Actually, when it was first released, it simply didn't work. Very few pages actually loaded, and there were errors all over the place.