Thing is,
When you're on an irc chat, you can do whatever you want, work

whatever. You can be passively present and when you come back from work/coffee break/shopping there's always the chat to review form the period you've been away but logged in.
TS, while GREAT when you're up for a flight needs constant monitoring since it's all voice.
So my personal preferred is to monitor an irc channel when i'm busy doing other stuff, and head on over to a TS server (Neoqb's or Homedrome's) when i'm ready to fly.
So in other words, IRC doesn't replace TS at all, it's different medium not requiring full attention. They supplement each other.
You should try it
