Quantshare has some helpful tools but it would have been nice to see them innovate more. We did a full review at https://daytradereview.com/quantshare-review/ and tested the platform thoroughly.

Quantshare has a large library of indicators and the backtesting tools were helpful. Overall, the most appealing part of this platform is the lifetime license. It's rare that you will find affordable lifetime licenses on advanced platforms with real-time data.
innovative and fast

I am an owner of Quantshare an I have to say that Im absolutely happy. Upgrading process is fast, they upgrade Quantshare every cca 40 days. They have fantastic helpful support .
Program ist fast and user friendly ( more then amibroker) an there are many very useful plugins to analyze
- rules
- ranking systems
- PBIL/Genetic Optimzer
- composites


Quantshare has easy vector language , or you can use more sophisticated c# language.

And there is a database of delisted US stocks http://www.quantshare.com/item-81-historical-quotes-for-delisted-us-stocks&rid=12799

... And many trading object: http://www.quantshare.com/index.php?option=Tabs&rid=12799

Hope this helps