Mini review of my experience:
I'll start with the pros:
1. Their voices
2. The special effects
3. Nice stage
4. Good set list
5. A lot of interaction
6. Best Song Ever
cons:
1. They were obviously tired as hell
2. Zayn was in a bad mood so he spent most of the show sitting back
3. They didn't seem to be really enjoying themselves
The crowd was really weak even though it was a packed house. I feel like most of the people there only knew What Makes You Beautiful and were just there to try and have sex with them after the show or something. The thirst was insane. Glad I got to saw Best Song Ever live, though. Felt cool knowing we were the second crowd to ever hear it.
After that we waited to see if they'd talk to fans on the way to the buses, but one bitch security guard said they already left so a lot of people left, but then another security guard said that they usually don't leave until like 12:30 (??) and I had school the next day and I was freezing, so my friend and I decided to pass up the opportunity and leave at like 11:30, and apparently they never showed, so glad I didn't waste the time.
And, poor Harry, he accidentally leaned forward as a tower of smoke was coming up from the stage and some got in his eye.
.
and I already have reserved 1D discography rate but I'm going to wait for the third album 
Example: Kelly Clarkson, Hilary Duff, Greatest Hits