RAZZ Ircle remains the best IRC client for the Mac. This baby installs and runs every time for me.
Things I like: 1. It works reliably. 2. Access to IRC commands from the console. Most Mac IRC clients do not provide this or provide a very limited command capability. 3. Full DCC, Xserve, and CTCP capability 4. Video capability 5. Automated functions 6. Scripting 7. It's small footprint. Many IRC clients are bloated.
Things I don't like: Too many windows to clutter the screen. On the other hand, I have a big screen so it doesn't bother me as much as when I had a smaller screen. Other clients go too far the other way by putting too much in one window, using tabs, etc. Maybe an option to use tabs would be nice.
(Version 3.5a1)