Traffic has gotten better where they've widened Ft. Weaver Rd. H1 is H1, though-- there's decent hours on it where it's not too crowded, and then there's really really bad hours! Going to town before 10am isn't something I would recommend, but it's never been too bad after that and before 4pm. Miss the rush into town in the morning, or the rush out in the afternoon, and you're good.
Kapolei is getting a lot bigger, that's very cool. We like to go there to go shopping a bit, to avoid going into town-- Costco and Target especially!