If you have time on your side then its great.,
This review is from: Chief Architect Essentials Designer 2012 (PC) (DVD-ROM)
Customer review from the Amazon Vine Programme (What's this?)
This software installed slowly because of the large file sizes but eventually is all worked fine, just needed more patience than I had!
You need to invest time in learning how the software works to get the most out of it. I found it very complicated and wanted to run before I could walk with it. The video tutorials really help but again you need time to watch these
Once you get started you can have great fun, whcih could end up costing you a load more money.
The print out function to give to your builders will defintiley give you a feel for what your house/extension may look like. If you want to go into more detail I am not sure this software can do all that. Basic version is fine.