I have been surprised to read several negative reviews of that product, which I have found to be very useful. I have been using it since the very first days I switched to the Mac, in March 2004.
What I like is that Foto Trimmer is extremely easy to use: no need to study the handbook, it is very intuitive. Then it is very stable - I use it often every week, and I don't remember that it even once quit. And it has all the basic features which one needs: one can easily change the size of a picture, trim it, etc. - exactly what I need before using a picture on one of my websites.
True, it has a rather plain interface, but it does the job, it does it well, and it does it in an easy way: one does not need to be an expert to use it, unlike some other tools for images. I don't hesitate to give it the highest rate on each category!