I don't have one but I've heard good things about them. They had a short run of a "bad batch" but corrected the problems. So, unless you have one of those, there is no reason not to install it if you want to tweak your performance. You just have to follow the instructions and make sure it's on a battery tender. There's always a chance any install can go wrong but the chances with the Shark are no different that other things if you follow instructions - which means it's low chance of error. If the question is that you can't do both, maintenance/correcting problems would be my first choice. I'm sure someone who has a Shark can chime in.