i use eSignal for 2 main reasons
1 they provide live data for ASX shares (which I used to trade), IQ feed does not.
2 eSignal has an add-on called eSignal Futures trader which links directly to CQG which my futures Broker, Macquarie, uses. This means I only need to pay exchange fees via eSignal and then the same eSignal data feed, covers Amibroker, eSignal app and my Brokers futures trading platform.
eSignal has been reliable and has reasonable level of support when needed.