I have several of both, the Stinger and the Promax units. I have had both units fail and have found the Stinger to be MUCH cheaper and easier to repair.
"You do not merely want to be considered just the best of the best. You want to be considered the only ones who do what you do.".... Jerry Garcia
"You just have to decide if you're a Tigger or an Eeyore,..I think you know where I stand on the great Tigger/Eeyore debate." Prof. Randy Pausch