not dinafem, but i did test my short stuff's onyx freebie and didn't like it anymore than whatever diesel strain i scored once either. it tasted extremely offensive to me EXACTLY like you scraped a dusty hardened old oil slick off truck stop tarmac & smoked it. even if it gave me dry heaves and i hate licorice, i'd STILL rather smoke durban poison than that. supposedly sour diesels are more lemony, but i've never tried one of those.
i WILL say though that onyx had a really fun euphoric touchy feely buzz different than anything else i can remember smoking. for some reason, it made me play footsie with myself while i typed. if it weren't for the lavor, i'd grow it again in a heartbeat for the buzz... possibly THE best HIGH for a date, but i think gals might appreciate the gearhead flavor even less and prefer to burn their lips on some spicy hot crushed red pepper kali mist or a fruitier strain.
i don't get diesel's popularity. i've thrown bagseed i grew near train tracks away for having that exact flavor, only stronger.