Each type of modeling has a purpose. Surface modeling is great for items that are very difficult to model using solids. A shampoo bottle is a great example of surface modeling. On a ROI, you have to look at the case that most of the training will not be retained especially if the users are not going to use the training right away at their desk. Many times company budgets are setup for yearly training of their staff, so if this fits in that case, then an ROI is not really needed. If one of your projects needs surface modeling, then time would be saved if a user goes to training. It is probably a tad more time saved then spent relative to the training cost. If the training is three days, then you might save four to five days in company time. Now if the user is completely new to Pro-E, then that is a new ballgame.
