NAMAN Er? Excuse me? Unless they've released a new version of Colloquy that I haven't seen, it's definitely _not_ more mature than Irssi. Colloquy won't even give ping times. There are a lot of other things Colloquy needs serious improvement in before it could realy be considered a mature IRC client. Right now, Colloquy is an IRC client I recommend for newbies who've never used IRC to start off with. Once they progress, though, I help them switch over to an IRC client that allows them to do more.
(Version 0.6)