Linkinus 2 is a commercial IRC client meant to be for a "rich social experience."
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Pro Searchable Logs
Linkinus 2 lets you search chat logs by keyword within the app. You can also enable or disable logging on a per-channel basis.
Pro An extensive feature set.
For those looking for a feature packed client, Linkinus 2 is for you. The $8 USD price point is almost justifiable by the feature list. It frovides features not seen in other IRC clients such as embedded media(Youtube, Vimeo, etc.) and can automatically expand shortened URLs.
Pro Major improvements over first version.
With the new version release, Linkinus 2 is up to 10 times faster. It also has new core features such as auto reconnect, proxy support and much more.
Con No Notification Center support.
Linkinus 2 does not support OSX's Notification Center meaning you'll have to keep an eye on the window as you won't be getting alerts straight to your desktop.
Con More expensive than most IRC clients
At $7.99 USD on the App Store, Linkinus 2 is more expensive than most IRC clients. While the extensive features may justify the price for some, basic users probably do not need to pay for a commercial client.