What do you like best?
This is definitely the most versatile and powerful CAD program at the best price. Not cheap, but it transformed my workflow and the quality of my presentations to clients. Once you get used to thinking in objects instead of lines (as in, drawing the wall, not two parallel lines), it allows for fast and effective 3D design that is particularly readable. As a Landscape Designer, I don't think there's another program that can model the landscape as well and give you such a realistic model of the site. Not only can 'walk-thru's' and 'camera shots' give the homeowners a clear and appealing presentation of the proposed design, but while designing you can see how things will, or won't work.
What do you dislike?
Mastering Vectorworks is a real mountain to climb. This is no simple Sketchup type program. I have several colleagues who worked through training manuals to learn VW, but most needed several days of intense training courses to begin to get it.
Recommendations to others considering the product
Take a look at several finished, rendered 3D landscapes and compare the effectiveness. I saw a real difference that made investing in VW worth it (and that investment was cost and time to train). See if the program you are considering and comparing will give you complete cut/fill calculations (VW does) or see how many schedules are built-in. Those are the big time savers.
What business problems are you solving with the product? What benefits have you realized?
After completing the planting plan in Vectorworks, the program generates a complete and accurate plant list/count/budget. It's an unbelievable time-saver that clients love. I've also used VW to generate hardscape budgets and overall budgets. Nothing gets the job going more than well-done budgets that give the homeowner a sense of control. What used to take me days to complete now happen through a click dropdown.