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i have used this for 4 years.
had my 05 envoy, 05 sierra, 06 monte, 07 cobolt, 07 hhr, also receive the emails for the diagnostics for the ones that i have on star in.
Also e-mailed them just today to see if they can get my VIN entered... I have been waiting since January but never thought to e-mail or call... just thought I had to wait.