Pros: smooth, intuitive, appropriately-featured, free
Cons: adjusting the view on the 3-D image can be cumbersome, working in three panes can be overpowering on small screen
In the process of moving to different locations, I had to plan furniture placements for an apartment and a house. I tried this and Live Interior in a "quick and dirty" test. Sweet Home 3D is the one that stuck with me.
This program worked very smoothly to do exactly what I needed in an easy manner. I could layout the floor plans quickly on hand the dimensions to the exterior house plan and/or the interior rooms. I could switch between the 2-D layout and the 3-D rendering quickly. I could even design a foyer that was wrapped in a three-segment staircase to a second floor. The program had all the tools that I needed.
One issue that I faced was the lack of enough furniture in the free version. I appreciate that this restriction is lifted in the paid version. Another was getting used to how the 3-D rendering could be "tweaked" to give the best view. In truth, I am only now tapping in to the different ways to walk-thru a layout in 3-D. Finally, working with three panes (furniture, 2-D plan, and 3-D image) on a small screen (MacBook Pro) was limiting. I can well imagine the software works far better using a second monitor with the 3-D image split off to it.
Other than this, I might add that I certainly have a lot more to learn about how best to do such things as extending existing walls around corners, changing display lighting in the 3-D view, and making the 3-D view fancy.
When your needs are as basic as mine (furniture layout), you likely cannot beat this program for feature/price ratio. I can imagine this program will also be very useful to plan an addition or remodel to a home. I like the free version so much, I will likely get the paid version from MAS to be ready for exactly such needs in the future.