My experience with imported step files into Solidworks has left me a bit frustrated at times if you require to have anything other than a static part. The Feature Works function for converting model to Solidworks features can be a bit hit & miss and dependent upon how intricate the part is. Feature Works I find has a tendency to create an overabundance of tasks in the process. I find that by using the imported body as a template to generate sketches for a retro engineered model.
I myself would like to hear what other import methods other members use to streamline the conversion process.