Decided to go with the beats

I'm really considering the M50s right now. I saw on Amazon that there was an included portable amp. Is this necessary for iPhones/iPads?    Also: comfort is really important to me as I'll being going on some long flights, and noise cancellation might be important. Thoughts?

I'm looking at getting some new headphones, and my main choice right now are Beats Studio. I looked at getting AKG Quincy Jones Q701s, but i cant have as much leakage as many people said that had. I realize that most people here hate beats but seeing as I'm not very knowledgable on headphones, I...