This was my experience 
I flew from N.Z. to see the concert, it was my only chance after missing out on SNSD and 2NE1 concerts in Seoul when I was there. After seeing the line up and realizing that I am a fan of every female artist performing I just couldn't miss out lol
Having booked my tickets from ticketek in aus I wasn't allowed a specific view of seating just a rough floor plan for the concerts design. I paid for Gold V.I.P. seating and was surprised that they were just plastic lawn chairs grouped into sections and tied together with plastic ties lol I thought it was gonna be something a lil more distinctive to separate standing from seating because once someone came out everyone in V.I.P. seating automatically stood up lol so in the end I spent most of the concert standing without the benefit of being that close to the stage which to me kinda negated the whole purpose of having the distinction within the ticketing option.
Even though the Stadium wasn't full I was still impressed at the turn out and the atmosphere was really great. Luckily enough for me some people didn't turn up in my row letting those left behind with a bit more room to move out and enjoy our space. Since the only info I had was it began at 7, I was unsure how they were gonna work it there being 12 acts in total, but I was a lil disappointed that it was only 3 hours long, giving each act a total of 3 songs, I mean for the ticket prices and for the distance they traveled to perform my guess was it would'ave been longer, then again I suppose if I had my pick not all 12 acts would'ave played and I could'ave seen more of my favs
but wouldn't every fan feel that way too? lol
I had a bit of a dilemma too, I wanted to get some fancam and pics, but I was still quite far from the stage for my lil camera lol and just how much time did I want to spend with my arms straight up in the air capturing the show staring at the lcd screen instead of actually watching the show :/ I'm glad I got the footage I did, but at times I had to tell myself to stop recording and take a look at my fav Idol stars... right there! in the flesh, performing, being in the moment or capturing memories, it was a tough balancing act lol 
SHINee up first was cool, but I felt sorry for them doing only 3 songs and then having to wait almost 3 hours before the Arirang farewell lol Speaking of the farewell where were the rest of SNSD? Does anyone know? I wanted to see Taeyeon, wave and smile like only she can 
The special stages were cool, I think MBLAQ and TVXQ were really charismatic, I think Miss A and 4 Minute looked sexy in their outfits and that SNSD and Kara were gorgeous in theirs. Seeing Hyorin was awesome, as my like for her has skyrocketed because of Immortal Song 2, I always thought she was sexy, but her raspy powerful voice and playful personality really has endeared me to her. I'm glad 2AM sung 'This Song' because it was the only song I knew of theirs lol so that I enjoyed. I couldn't actually believe it when SNSD came out, it was a very surreal feeling. My only regret was that I didn't sit on the left hand side, cause that was the side Taeyeon walked down
so I missed out on a closer up view of her, Sooyoung and Sica.
In my opinion tho CNBlue stole the concert, their stage really got everyone around me moving, and Yonghwa surprised me from how I've come to know him thru WGM, he was an awesome leading man lol I really enjoyed their stage.
It was all far far to short tho, I was just starting to get into each act when they were hurried off the stage in preparation for the next lol Just gave the whole concert a very rushed feel, even with Yuri and Fani's MC'ing thruout.
All in all I had a great time, next time if I ever get to another concert I'll make sure I go as close to the stage as possible lol While the acts were extremely professional and polished as only all of our fav Idol stars can be, I felt the concert itself could'ave been better, sound was patchy in parts and had complete vocal cutouts in others, the lighting was awesome and the set design was very cool with each acts own personal style for their stage. A great memory to put away and cherish again and again, until we meet again, SHINee, Miss A, Sistar, 2AM, Secret, Beast, MBLAQ, 4 Minute, TVXQ, CNblue, Kara and of course SNSD, saranghae!! and Fighting! ^^
The other SNSD members had to head to the airport and catch the flight back to Seoul the same night as they need to be on Inkigayo the next morning. The concert was great, but I was a little disappointed. I wanted to see Seohyun & Yonghwa sharing the same stage, but too bad, there was no Banmal song.
You're absolutely right about CNBLUE's performance

Everyone around me was singing along, screaming & waving on all 3 songs they performed. I love CNBlue

as much as I love SNSD ^__^