Interface is clean and fairly simple to use, connects to all major IM networks including Jabber, and GoogleTalk, tabbed messaging for easy use of multiple conversations from different services at the same time.
It gets disconnected when the phone goes dark.
Jabber does not have an SSL option.
You cannot log in with multiple accounts of the same service at the same time or save multiple identities for same service.
You cannot bring up the on screen keyboard when editing your accounts (I have a screen name with an _underscore_ and my Treo doesn't seem to have a button for that)
14 day trial of a program with bugs, if you are willing to pay for a program, buy a better one, if not, this one will last you two weeks.