Well worth using -- plenty of good overall information, advice, reviews, and links you directly to a wide collection of vendors. Plenty of support to help you choose the right solar system for your house, with unified messaging, links, equipment reviews, supplier reviews, and links to outside info sources as well. I ended up here after exploring instructive the superb YouTube channel by 'Undecided - Matt Ferrell', who has a careful, detailed engineer's approach to explaining latest advances in energy conservation combined with his own experience and advice as a long-term enthusiast and purchaser. He recommended EnergySage, I looked into it, and agreed -- it's a great way to get started, dig in, and go all the way to a well-considered purchase and installation of your own.