well alot of times its operator error. the no name, buck 50, destroyer, fat boy, x force bla bla bla have all had the same complaints.
this is one reason all keydown boxes that will be run at 20-21 volts are tested in my truck. if its going to blow due to design or build issues it will blow then. none have blown to date. but they have blown in the customers truck.

but the one thing thats great is everyone has a choice to use who they want