I purchased this pen as a gift for a friend who is going back to college this summer.  So far he loves the pen.  It writes smooth, crisp, and clean.  He likes the gel ink, but he would prefer a more traditional ink cartridge.  He doesn't mind using the ink, but we were both confused as to why this pen supports gel ink ballpoint, felt tip, and a highlighting marker refill but cannot accommodate a traditional ink refill as well.