I really like Esignal, but this is absolutely not worth the money: no customization, only web-based. The so-called scanner is rather an advanced hotlist than a scanner.
If you look for a good real-time scanner, look at First Alert or CyberQuant from Cybertrader. eSignal marketscanner is not usefull to find interesting trades. It can't be customised and and the web-based interface sucks.
I tried it for one month and this was a pretty weak tool. Web based, no ability to customize at all, it looked like old technology...
Pretty bad when you know eSignal has very good developpers. I think they didn't focus enough on this 'tool' right now. Would need a complete redesign as well as an integration inside eSignal to get access to scanner based on formulas for examples.