One of my friends asked if this would be good time to buy really big stake. I said yes, but I would like to hear more opinions.
No one can tell you the answer. Your friend should do his/her research and make a decision. Come on, its called investing.
It also depends on whether your friend wants to invest or trade. Short term or long term. This all makes a difference.
My opinion - we go up short term. I believe we will see $150ish again at some point in the future. I think long term we go up much much higher.