I just bought a used apex unit and started wondering why so many of them were showing up for sale within a few months of purchase. I started researching online and began to find horror stories about people who either trusted the Apex to perform its specified functions and were sorely disappointed, people who bought accessories that failed within a month or two, and those who encountered problems with Neptune customer support. Is this unit really worth all the fuss? Should I have looked at an Apex competitor, saved myself some money, and gotten a brand new unit?