[Mahler9th]

Both are excellent products and work very well. They come with excellent instructions. They were developed by Craig Watkins. I remember visiting with Craig in his home shop when he was developing the SmartStrings product, and he was very meticulous and systematic with the process.

They can be used on a variety of vehicles.

There are many commercially-available tools for these processes, and of course one can fabricate their own using a variety of approaches. From a time versus money standpoint, these two tools are excellent.