I started to work with FEA in 1992, with ALGOR. Now I am using CosmosWorks. I did not tested CosmosExpress (there is no need, having CosmosWorks). FEA is an important tool to check and optimise your design. It's getting harder and harder to be on market and you must allways search for new solutions and low manufacturing costs; FEA will help you to select solutions with lower costs but maintaining quality. But it's a very tricky tool. You must allways validate your analysis and that means run several models, with different meshes, in different conditions and check if the final model as a predictable and understandable behaviour and the solution is converging for a good one. So your FEA tool should allow you to change mesh parameters and refine it where needed, change de restaints and loads,..., to provide you with results to check the final study. Otherwise you should allways limit your studies to the simple cases and be very careful with the results.
Regards