The life expectancy of the Hydras is indefinite. They do not generate heat and are passive in operation. The only thing that can go wrong would relate to a weather or surge related event and we will replace the protection free of charge for the life of the unit. That has happened only 4 times in twelve years world-wide. There is no pressing need to upgrade what performs well. Obviously, we are a "research" based company and its the nature of our business, so evolving and creating better performance is what we do. No need to apologize for that.
best regards,
Grant
Shunyata Research