Yeah, we need some kinda 'provenance' like the art world uses to determine authenticity. That's why I laugh at "g13". You're telling me some guy snuck a cut out of a lab 30 years ago and someone has kept track of it when many growers mislabel cuts constantly? It does usually mean that it's pretty good if nothing else. I have been lucky enough to either be the grower, or 1 step removed for many years - easier to know what to believe.
I will say that I've partook (can you believe spellcheck accepted that last word?) of my sour diesel strain (and it's concentrates) w/ patients who've had everything from back pain to ms/cancer/ptsd/etc , and every one of them claimed it was the best meds they have had for their condition. Some liked sativas, others indica. Some liked high thc, others high cbd. I think it comes down to strong genetics of super potent strains working best for most everyone. I don't mean to minimalize anyone's experience, but this has been mine.
This may seem biased as I am trimming some right now, but I've kept this strain in the garden for close to a decade - even though sometimes you're lucky to get 2-3 oz/plant. I'll snap a pic for 'my stash' shortly.