Eltee, I have NEVER had a problem with it. I could change tunes whenever I wanted with no problems at all. I had it tuned for 87 octane and 93 octane performance.
You should have no issues. Just let the programmer you choose know what your code is and ANY mods you currently have as well as what you want, mileage, towing or performance and what fuel you intend to use, 87, 89 91 or 93 octane
As far as shape is concerned, it stayed in it's original box when not in use. I will rebox the whole package with extra padding for additional safety and if there are any problems I will refund your money. Now after you have rewritten the files to your vehicle it is yours for keeps, it does not have any software, you either send the unit to the programmer or they email the files to you and you connect the unit to your computer and download.
D-