I think Neil's talking about the weird shadows that Solidworks renderings have under the models. They make the model look like it's levitating some distance off the "floor".
Shadows can be turned off, in Solidworks display options, by the way.
Like a lot of "advanced" things in SW the shadowing kinda works but when you really look at it, it is not very realistic.
I do like SW though for bread and butter basic design work, it's pretty robust, and it's easy to learn. (it's the fifth major high end CAD package I've had to learn for work). Accuracy can be an issue though on large parts needing fine tolerances, and getting large assemblies (5,000 parts +) to hold together while rebuilding after a revision can be challenging. JD