It crashes way too much for the price you pay. It always seems to crash during times I need it the most too! No way to contact someone for help and on the rare chance someone does get back to you they don't answer your question. Save your money and use a different search engine.
I've been using You.com for around 4 months. I tested the Pro version briefly, but reverted to the Free one since I discovered a more cost-effective tool with improved UI and UX. It's quite good, particularly the Chrome Extension, which proves to be very useful.