I used to use iqFeed with QuoteTracker.
Now I do not use it.
Reasons:
1. It does not update quote in the pre-market time. The open price will come in after open.
If opening price is important to you, do not use it.
2. Recent instability of iqFeed.
3. No warning for retiring older versions.
I found it out only after it stopped working, causing a big loss in my blackbox. This pissed me off.
If you want to cancel your iqFeed account, they will charge you up to one mouth extra, citing that they already charged your credit card for that mouth.