In 2014-3-30, the exponential trendline model gave a buy signal at $460 and the price has been unable to go below it for any extended time even after 4 weeks.

In 2013-11-23 it gave a sell signal at $872 (SlipperySlope's 0.40 confidence) or 2013-11-28 at $1,056 (my 0.45 confidence). It was also unable to stay above it for any extended time.