One of the greatest features of Pirch is that it's able to connect to several servers using various accounts. As it was done with various accounts simultaneously, it was really useful.
The interface used in Pirch is totally outdated, something that old time computer users will probably like, but that the majority of users with less level, and more used to simple interfaces without too many configurations, will probably hate.
Nevertheless, you don't need great functions, icons, emoticons or animations to chat by means of the IRC protocol,... a text box and a visualization area are just about enough. Pirch offers much more than that, but you should try it out yourself to see all it has to offer.