I find that red Virginias have a slight hint of something that reminds me of cigars, not just like a cigar, but just a touch of je ne sais quoi. It is a Virginia that has been color cured with the same principles that cigar leaf is color cured, except in a flue, instead of a stack. It hits the bass notes in a blend with more high end flavors, like lemony Canadians or the casual oranges. Yeh, by itself, without anything else, it can be monochromatic, but it definitely isn't flat, and it does shift in sweetness as the bowl progresses.
There is a bit of fermentation that takes place in aging, and i've pulled some acetic acid flavors in aging my own homegrown tobaccos, which comes from bacteria that takes hold in the fermentation process. But, I'm not privy to exactly how McClelland did it, but I have never associated The McClelland Virginias with actual vinegar. Their latakias have more of that ketchupyness, along with a barbecue aroma. I had assumed it was their process.
I am still setting on a pretty pile of Red Cake, but there is nothing else out there like it. If you haven't had it, just chase something else. It will just be much easier for you to run down something available. Personally, I would never send someone to try the Sutliff faux-Clellands. It's like sending someone to ride a Kawasaki Vulcan to see what riding a Harley is like. Maybe one day, the McClellands will reveal their secrets, but till then, maybe try to enjoy a Honda Goldwing for what a Goldwing is like.