This is obviously a classic. I hadn't had it in a number of years and bought a nice ounce here in Seattle recently on a whim. Sour D might be my new favourite strain overall, and is definitely my new favourite daytime strain (was Blue Dream, but I find that the phenotype commonly cultivated over the last ten years has become more middling, less euphoric than it used to be and than I prefer). (Having said this, I always love it for the evenings also) My other favourite strains, for reference, are Duct Tape, Dutch Treat, and OG Kush. I find Sour Diesel helps me sit my ass down and actually complete tasks, even intellectual ones (I've been coding all morning, to wit), as well as lowering my general anxiety/feelings of apprehension/general malaise, doesn't especially give me the munchies but makes me feel calmer and less anxious about eating, helps with the general feeling of hating everyone and everything when I'm getting my period, and is generally complementary to whatever mood I'm in: relaxing in the evening watching telly; fun with making music or playing video games or just taking a long, hot bath; motivating during the day, not in a super-stimulant way but more by way of removing anxiety, which leaves me feeling like I have more positive, happy energy to do stuff.