I used this component for several years. Unfortunately I must say that the latest version has a really bad upload page. The choice of category to put the listing in is so very messy and non-intuitive that no-one of my users understands it. It is also made with ajax and it create script conflict. If you are dependent on users upload listings - go for another component. I have always been surpirsed to see that there is no comment management of the component. So you cannot delete any comment without doing it directly in the database with phpAdmin. Therefor I never used the comment system of Mostets Tree but integrated JomComment. It could have been one of the best and most useful components for Joomla, but it falls on these issues.
I find it very easy to use and maintain. Thanks to clever select lists in the administration it is very easy to select which names to edit or view.
Also the support is great. I asked the developer if is was possible to implement swedish characters in the Alpha index and 30 minutes later I got some new files to use. And it worked immidiately with the swedish characters. I can only reccomend the this extension.
As important as a good product is good support. And the developer is always very helpful and quick. After switching template I got problems with my menus. This was not a problem of this component but a template problem. Never the less the developer rewrote my template to it work. What about that service? I am used to developers of templates and components putting the resposibility on the other part.