Since purchasing my MPVI Pro unit, I have had nothing but issues from this controller. For example, today I was attempting to disable the VATS on a 2005 Canyon and it would not allow me to write the tune. After numerous attempts and receiving the same error message (boot downloader request time out) I eventually had to tell the customer to revisit another day. This is not the only issue ive had with this controller. I also believe that hptuners has a terrible support line. There is no number for me to call and it takes days before I hear a response from the support team and this results in me losing business. This product has done nothing but cost me valuable time and money. if anyone has any insight on what I can do to fix the issue mentioned above, or is also unhappy with hptuners, please feel free to comment on this thread.