If you don't mind me asking, have you had good experiences with QuickFix?

I ask because while implementing the DTC plugin, I stumbled across this complaint from the Sierra Chart staff:
https://www.sierrachart.com/SupportBoard.php?ThreadID=15382
Quote:
We have a very poor impression of Quick FIX and consider it very substandard quality and buggy.
I'm not sure what kind of bugs they are talking about. They do appear to have strong opinions and think highly of their programming ability.