I like the program a lot, most of the tutorials are ok to very good, many are not so good and some for instance provide an unworkable work flow that over constrains a part precluding for instance being able to line up bolt holes.... a stone wall if you run into it the solution is to do the construction sequence as though the item were on your work bench, that sort of logic cures the issue in most cases the help desk is superb same with the guy who sells it locally.... so Im doing well on assemblies ... perhaps I can build a skid now, Im getting close Its about 500% less buggy than inventor... Phil scott