I first bought this about as soon as it became available, April or May of 2018 as I recall. N upending it, I detected the greasy feel that I always associated with PG. I spread the contents out, left them overnight and the greasy feel had totally disappeared, which is way faster than I would have anticipated. Still scratching my head about that, my experience has been that PG just doesn’t dissipate that fast.
That first batch had a vinegar aroma, but not overwhelming. Other orders have been more noticeable in the vinegar aroma department, but maybe that is because others have written about it and I have been more alert to finding it.
5100 was matured red VA. 515 RC-1 is matured Bright VA. My understanding is that indeed Sutliff does have bales of this leaf that have, like 5100, gone through “sweats” (fermentation), so an acidic aroma is to be expected, but there is every reason to expect that they would be somewhat different, since the variety of the leaf is different. IMNSHO, neither are bursting with flavor smoked by themselves, and that is coming from a McClelland fan boy of decades.
I find 515 RC -1 mixed 50/50 with Sutliff 507-S, each dried overnight, then mixed and packed tightly in a jar for about a month, to be a great smoke. But when McC was still in business, I smoked far more 5100/5105 mixed the same way than I did either straight up. I have some of each Mixture in small jars by my smoking chair now, and smoke them back to back on occasion. They aren’t quite identical, but I would be hard pressed to say one is better than the other. Speaking of pressed, on another forum guys have used a noodle press on the RC 1/ 507 mix and reported good results.