I've used Ashlar products for many years now. They have always been known for their intuitive interface. Unfortunately they have also been unstable and slow to upgrade. Xenon is easy to use for simple modeling. It is also easy to generate nice limited subject renderings. However I have always been challenged with creating more complex geometries. The ACIS based model is not friendly to the Nurbs surfacing and protyping world I interface with. The modeling does not do well with larger scenes. The shadows quickly become aliased (jaggy). I will not be renewing my license. There are too many other programs that appear to offer greater capabilities and value.