I have decided to compare Multi-Service Instant Messengers by factoring three things. Out of box experience, ease of use and customization. This way users can see what will fit their needs best.
Digsby is the best of the bunch offering the best out of box experience and the easiest to use. It's customization isn't one of the best but it's ability to sync your settings makes it a must have. Other nice features people will like is the Facebook Chat, email accounts which you can reply to straight from Digsby, group chat, free video and voice chat and other nice features like all your favorite services. All of this is free and without limitation unlike Trillian in which you have to "pay" for certain features that Digsby offers for free.
The downside to Digsby is and always has been is the installer. The newest one makes it harder by making the user push "yes or no" verse just unchecking things. This is bad because people usually just click next after unchecking things and might accidentally think everything is already pre-unchecked and hit yes thinking their hitting the "next" button.
Overall Digsby is a must have for those who want the best Instant Messenger experience without limitations. However if you want great themes and emoticon, you will be better off with Trillian which seems to have the best themes around.
Best:
Full Featured Instant Messenger
No limitations Or Paying For Certain Features
Syncs Profile Settings
Facebook Chat
Ability To Answer Emails From Within Digsby
Worst:
Bad Installer
Can Freeze Up
Can Hog Resources
Not Many Good Themes To Choose From