Yes, that one is accurate and reliable since it's now a subsidiary of Dow Jones & Company and we knew Dow Jones is the famed WSJ. I wonder why they don't have a similar thing for realtime under subscription fee. It's very useful for developing a semi-automated system.
Quote from gudway:
I would love to find a stock screener like MARKETWATCH
www.marketwatch.com/tools/stockresearch/screener/
Like you say, depends on what you want to screen for.