Here are some of the features according to the JMBSoft Website: I noticed Link X is kinda similar to phpld.
In which case they probably won't be very popular. If they want to succeed they need to come up with a feature or idea that no other directory script has implemented. There are various directory scripts - i believe their were 2 new scripts released recently. To get results in this ever growing business/industry you seriously need to stand out from the crowd!!!