I’ve been beta-testing this for a while and it’s awesome. It’s also very generous of them to make this a free update. (I advised against that, given the modern App Store economy and the massive scale of this update, but they’re too nice.)
Before, Dark Sky was a great secondary weather app, performing a role that the others didn’t (very accurate short-term precipitation predictions) but without the basics like temperature and forecast data.
Now, with those basics added, plus major upgrades to the short-term precipitation features, the new Dark Sky can be your only weather app. (If you live in the United States.)
Comparisons to recent indie favorites Weather Line and Check the Weather, both full-featured weather apps that integrate Dark Sky’s short-term precipitation API, will naturally arise. Weather Line and Check the Weather are both primarily about general weather info with some Dark Sky features added, while the Dark Sky app is still focused mostly on short-term forecasting with some general weather info added.
You can buy all of them for just $8 and see for yourself which one works best. For my usage, caring mostly about short-term forecasts and a bit about the rest of the week, the new Dark Sky is my favorite.