What are some alternatives?
When comparing IRCCloud and irssi, you can also consider the following products
HexChat - HexChat is a fork of XChat with bug fixes and new features.
KVIrc - KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit.
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
mIRC - mIRC: Internet Relay Chat client
WeeChat - WeeChat is a fast, light and extensible chat client.
Kiwi IRC - A hand-crafted IRC client that you can enjoy. Designed to be used easily and freely.