If one already owns version 5 or version 6 of EFILive (the standard of the industry scantool), the upgrade to the version 7 tuning package is only $199 which includes four VIN tuning slots. You can read any 99+ PCM without affecting your four VIN slots. One only uses a VIN slot when you actually flash a PCM.
There's a lot of behind the scenes history and dirty laundry between EFILive and HPT. Let's just say I chose the company with the higher moral standards.