I read on here that people had experience with Big Balls (china bones 6 balls), not breaking-in.
I recently used some old ones on a cruiser and they spin pretty good - i wonder if the soft wheels and harder core make a difference
I think the biggest issue with the Big Balls bearings was the ball retainer being too thin and breaking apart quite easily, for which Skate One issued replacement ball retainers before upgrading all their new product.
Even older ones by now might be the newer ones with the fixed / thicker ball retainers, but if you are unsure, just get them out and have a look at the back of them.
A few sets others have had still skated fine up until they blew out completely, not all at once of course, but one here or there. The set that was left with me after two blew have another four with the ball retainers in pieces and two that look like they only have minimal cracks in one area of it.
Worth checking, even for a cruiser.