Apart from the simulation part... What were the things that made you conclude that execution was better... Can u share an example if possible for benefit of all.
For starters they can execute orders in Multi client code with one entry plus money management with them.
Also, they are very open when it comes to APIs..
https://twitter.com/symphonyfintech/statuses/430680403809013760
But i seriously think Reuters will give us a worldclass product, if they decide to provide it to retail as well. (Omnesys is bought by reuters)