I've got one of those 1705 POS tuners, I only trust it as a code reader now. IT ACTUALLY VIN LOCKED ME OUT OF TUNING ON MY OWN TRUCK!!!!! Only used it on the OBS, never the other truck. Sent it back twice in a year to be fixed under warranty, still had to pay shipping....crap. Now I'm not even sure if my trucks stock tuning is really stock anymore.