It was a pretty good issue! Usually I don't like dream world stories but it was nice seeing some history and places on Krypton.
It starts off with Kara reliving unpleasant memories with her mom on Krypton and transitions into fighting the Black Banshee throughout her memories of various places around Krypton. There was a fantasy theme to the dream sequences that seemed to work surprisingly well for a Super book.
Some new character tidbits: Kara and her mother seem to have had a bit of conflict with her father being the more sympathetic figure. She also seems annoyed with "Tradition" and antiquated Kryptonian family expectations.
It'll be interesting to see where they go with silver banshee after this, and if the introduction of a new character leads to the start of a regular supporting cast.
Interesting compared to the previous volume of Supergirl. I think she had flown around the entire DC universe and had gratuitous hero vs hero fights with every character and team in the universe by issue 10 of that volume. This volume its been 10 issues of finding out what happened to her home, making a couple new or reimagined villians and a couple of characters that may be the start of a regular status quo. To date I think the only other hero she has met is her cousin (and Superboy over in his title). Quite the good first year for this new 52 title.