Mast Base Comparisons

Currently there are three designs for the actual mast to board linkage — the rubber, the tendon, and the mechanical. These designs have been around for awhile and can be drastically improved be breaking the current paradigm of assumptions. We need a system that functional, will not break, maintenance free, insanely easy to use, safe, and seamlessly integrated with rest of the rig.
Functionality is pivotal in selection. In my opinion the mechanical is not useful. The rubber UJ is generally preferred by wave and bump/jump sailors because it provides better shock absorption which is easier on the gear and your body. Conversely, the tendon is stiffer and preferred by racers, slalom sailors, and flat water speedsters because it is an efficient transfer of energy from the sail to the board.
Durability may be an issue. I have found the rubber more durable but other people swear the tendon is more durable. Be sure to perform a gear check every time you enter the water. Check for cracks or tears in the rubber or tendon. The Tendon will begin to bulge. Be safe and replace any questionable piece.
Failure Safe! The double strap on the rubber system keeps the system in place in case of break down. I have found it works and with a volcano pad, also saves your board from damage. The line on the tendon system does not work — I have had the line break many times; which is disastrous because sail and board get separated.
Maintenance. The rubber UJ takes a bit more work to repair or replace because you must disassemble the unit. The tendon is simple. Undo 2 screws and replacing the tendon. Remember to have a windsurfing shop do the repair.
User Friendliness. Personal preference is very important and some people just like one system over the other. Some sailors say the tendon foot bends easier and the board must be flipped upright more often when in the water. Some just like a certain design or the opinion of a respected local sailor.