QUICK NOTES....  Below is a summary of what components come in each Kit. (The following does not apply to the GME/Icom Bike-to-Bike Kit, which is designed for a Single/Solo Rider only)

Basically the Logic and Super Pro units each come in two kits, the SINGLE Rider Kit, and the DUAL Rider & Pillion Kits.

The Logic & Super Pro both have many features such as Mobile Phone connectivity, Music connection, Bike-to-Bike capable, GPS, etc, and of course Rider-to-Pillion communication.  These capabilities do not change with any of the Kits, and both Kits can be later upgraded to any of these features, however depending on what you plan on starting with, will depend on which Kit you start with.