This is;
A ) Huge. A giant win for the 2A.
B ) A certain move to the 9th Circus where one of two things will happen
1) An appeal will be made to the 9th by The State of California, which will 75% be overturned in the state's favor, and subsequently sent to SCOTUS
2) The state MAY elect to work around by passing other legislation rather than take the chance of a loss at the SCOTUS level which would invalidate magazine limits nationwide. That is why DC let CCW permits go through, to avoid a national loss. If HRC had won the White House and packed more Leftists on the bench, I would see this as being fast tracked to SCOTUS for permanent losses for us, but now...it's a toss up leaning in our direction.
One note - Prepper Gun Shop worked all night last night filling mag orders, only to be told by the lawyers the next morning to cancel all of them and refund the money. Not sure why, as the order is stated to take effect immediately, like that golden window in DC when anyone could carry openly or concealed without a permit for a couple of days.
All in all, it's one ruling I would have never expected to ever see out of the Golden State of Insanity, and I wish them the best from deep in my heart. NRA, GOA, SAF, JPFO, get in there!