Luciethelakie - I don’t have any first hand knowledge. However, even the more selective public universities in PA. lose many of their students before their junior year. Therefore, they need transfers to fill their classes. Statistics show that students who complete 2 years of community college and do well in those classes are likely to do very well at 4 year colleges. I believe most public universities in PA. have agreements to accept PA. community college class credit, and many have transfer agreements. It may be harder to transfer community college credits across state lines to some colleges.
The one place transfers may be harder may be Penn State - because they guarantee transfers to students from their tens of branch campuses. If Penn State would make it too easy to transfer from a community college to their main campus, fewer people would pay the high tuition Penn State charges at their branch campuses.