I am in the process of moving my mod to the next stage, which is the look and feel (as opposed to the php side of things).
The downside to me is obvious, page load and bandwidth.
AJAX, as you know, will do pretty much the same thing, only it retrieves the data and builds the html on demand (ie with each click).
The downside of AJAX, is that maybe the server request is missed for some reason. Then it doesn't work.
What are your thoughts, mod authors?