Still didn't explain why the Dazzlings have their voices. Maybe it's a vocal loop thing but actually they'd still have to be singing the words so I'm not persuaded. Unless they relearnt to sing since RR. Otherwise I liked the twist that they weren't the bad guys. Although it was also pretty obvious from the off who had the device thingy because otherwise the plot wouldn't make sense. They seem their usual selves albeit I'm not sure how I feel about their cameo like this. Them lecturing Sunset a little on living life was a bit off the wall.
Pinkie Pie totally ruined Sunset's first two tries. To give Sunset credit she tried a second day with Pinkie and it still ended badly. I don't blame her for going off on her own on the third, the problem is her doing so didn't make sense to her friends because they hadn't seen the stuff beforehand. Problem of being the only one aware of the loop.
Sunset always gets great character exposure and development and we didn't have a monster trying to destroy equestria which is awesome. Also her going off on her own on day 3 kind of reminds everyone that she's not always been the heart of the group but did stuff on her own beforehand, so I kind of liked that. Also that she used her magic but only in a lowkey sense. Magic other than the device was really lowkey in this one. Pinkie mostly used hers for special effects (and once for breaking and entering xD) and Sunset I think only twice - on Adagio and on whichever postcrush girl it was - to fix on the truth. I'm glad she only ever uses such a strong power in necessary situations now she can control it. Nice manipulation of the villains at the end, by persuading them to shake hands.
Not sure I believe how it ended, too convenient that they just happen to know drums and a guitar are the right instruments and they can play them??
The security guard amused me
Bribing him with a kitten is not responsible pet care, Sunset!