I use the darksky website everyday. It's by far the most accurate information about weather (much more so than accuweather and weather.com anyway). It's accurate down to within a few minutes. It's very impressive. I understand why Apple bought them. Highly recommend.
I needed a few amendments on my delivered paper and they were all done without the need to pay any extra money. I found them to be quite honest and patient, they worked well on my Psychology papers, and I'll be back as soon as the semester starts.