Bronze membership is full of advanced charting features, but with delayed data, and it costs $10
Silver ($20) is with 130 indicators or so, and real time streaming charts, not a snapshot, and it's as accurate as anybody else's who's claiming streaming quotes and data feed. Therefore, you don't need to refresh, it does it for you.
They are also one of the data providers for Medved QT:
"Prophet.NET-Subscription service - It is specifically optimized QuoteTracker and provides fast snapshot quotes. It also supports all the QT columns including BID/ASK Size, Last Vol, TICK, # of Trades, Avg Trade and others. If you are not satisfied with your current quote provider, then ProphetStream is the way to go. "