I have used this component for 2 weeks and am glad I did. Since my visitors are mostly very quiet, it's very difficult to guess whether they are present, what they like to read and whether they generally like what I present them. Having this tool is to be able to have somekind of a feedback after all. I use this together with the standard Who's online component of Joomla 1.5.22. I noticed that this component is reporting very high numbers of online users while j4age is showing much lower numbers. So I asked the support team how this can be. Andreas Halbig replied and ask me for some screenshots to study the case. Then he studied the standard Who's online component and concluded that it's this component that is counting too many online users. A free product with a professional grade support is more value than you can ask for. So I write this unsolicited review to thank them for their support.
As an improvement I would like to see an accompanying improved Who's Online component to replace the standard component, if that is not too much to ask.