(Actually, it works for any stock or future symbol if you type it in the right way - see the web page for details)
I like it because it won't fill the limit order until it ticks past your price - real life it is easier to get filled - if your edge plays out on this, it'll be real viable with real fills.
No IB account? No problem, you can downlaod a sample playback data file to do your trading simulation, or with the just added feature, you can simulate the market data using a random number generator.
Playback data can be plotted to any charting program that uses TWS API, such as SierraChart or QuoteTracker.
I will be adding new playback source support, currently in the plan is playback data from ensign, CME globex time and sales data, and QuoteTracker data.
I forgot to mention, if you use MetaServer RT software to connect to AutoTrader, the playback data from AutoTrader can be fed to TradeStation, MetaStock, Ensign, anything that MetaServer RT supports.