1) when talking to someone who is on a cell phone IM client instead of a regular one, Adium without jabber shows them as "on via a wireless client". Adium with jabber just shows them as "on". I don't like losing that bit of information.
2) when sending them IM's from Adium, via jabber, my messages come from "johnkzin@aim.jablet.org" instead of just "johnkzin". I would prefer this to be transparent to my correspondents. They shouldn't know if I'm directly using AIM, or using AIM via a jabber gateway.
3) the icons on the tablet, for presence, kind of annoy me. "Red" means to me "online, but away", not "offline". Instead, "offline but away" is shown as yellow. If it were up to me, the "offline" icon would be dark grey (showing your own status as invisible would be light grey). The "away" icon would be a red dot. Yellow would be idle. Green would be not-idle (as it is now).
These aren't jablet's fault, of course. #1 and #2 are either Adium's fault, or the fault of jabber gateways in general. #3 is a Maemo issue. But, it causes the experience to not quite sit well with me. Not sure how I'll proceed with this for now. Though, I do appreciate all of the work that went into this.