Vaping this after 10 days on a Goon LP, 0.35ohm, dual coil SS316. The RY4 is very nice, caramelly on the inhale, with the subtle bourbon on the exhale. I feel like the vanilla custard is there as well, but it's subtle. I don't really taste the graham cracker (althought I suppose it might be acting more as binding the flavors together) nor the toasted marshmellow.
Recipe is delicious however. Agree with the KRUCIAL's review that bumping the toasted marshmallow might further improve it.