PHPjabbers have some of the best scripts on the market. I have been using some of their scripts and they all do what they says. Nothing is ever too complicated with them.
Anyway, if you need a script packed with many features, look everywhere else. For me a simple software solution needs to be cut loose of necessary features. Only a few companies nowadays can make off-the-shelf software solution that are not too complicated and full of unwanted features. And such a software is very expensive. I personally prefer PHPjabbers for my script needs. Their scripts are always greatly simple, straightforward and affordable.