Beejive is multi protocol IM (Instant Message) client for iPhone. Most of iPhone users use Fring because of its price (free), so no one takes care of 1,200 yen app for IM.

I guess I wouldn't have paid for it, if I did not need look for an app which could run / connect in background and supported Jabber Group Chat.

There is not any better app for Jabber Group Chat than Beejive. This app is so stable and use less battery. It is worth to pay 1,200 yen.