As a brony, I was incredibly pleased by this, but I have to review it as a newgrounder.
The animation here was splendid. The delivery was really good, but it would have been nice to see just a bit more variety. (more background ponies, slightly more detailed backgrounds, etc.) I am not trying to be nit-picky, but the lip animation was just a little off. I won't deny that it was very smooth overall.
The artwork itself was fantastic. The colors were blended very well. I can't tell you how many people just put too much pink on Pinkie Pie. The filling heart, and the suns at the end were just a very nice touch. I loved it. the Inclusion of the rest of the "Mane 6" was very well done.
Finally, the audio. I am very glad that it didn't sound choppy at all. Very clean audio is a very good thing to have. I have personally added audio into some AMV's, only to find that they sound like garbage afterward. All in all, ponies or not, this kind of high quality is the kind of stuff I like to see here on NG, and I look forward to your future endeavors. SMILE! You did great!