GoPro (GPRO) -- is it a buy?

9/1/15:  Is GPRO a buy here?

9/11/15:  10 days later

 9/21/15:  10 days after that

 
9/30/15:  10 days after that (and after earnings on 9/28)

GPRO reached a top of ~ $98 on 9/30/15, and has been sliding since.  No buy signal yet...