As much as I would like to help I just don't have the time right now to go through each chat box. All I can tell you is that I was very frustrated with each one of them and I ended up coming back to this one..
The problems I had initially with this one were really css problems with the style being used.
In reality it only takes a few minutes to install and configure any one of these chat boxes.. I would say to just try each one and see which one you like best. As far as resources go though it really depends on the features and the settings you use. You can really bare-bone this if you want and it doesn't cause much of a problem..
In my opinion this one is the best and it is just my opinion..sorry I can't give you pros and cons..
Thanks,
Richie
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