I had the 12k it could have just been the one i had but it would pull about 3 ft then stop then a little more then stop thought maybe it was my old battery replaced it with a die hard platinum same thing. Took it back. If you do buy one get the warranty
i have the smitty but if it goes ^^ up ill probably go with an engo.
my smitty has been great. i have at least a hundred pulls with it over the length of time ive had it.
funny ive only used it to save myself maybe 5 times.