Fems seeds from good breeders are definetly reliable, unfortunately greenhouse seeds dont seem to be part of them, and moreover i heard bad storys about growing seeds bought in the dam (but i didnt understood exacly how you got them)...However on the genetics i can say to u that the original cheese is just a pheno of skunk that made its own way in england during the 90s which was grown and brought to the light by a movement called exodus...However really donno about greenhouse seeds cheese but if someday u want to try some other seed banks i can confirm that big buddha cheese (cheese x afhan) is very good smoke...so concluding your question the true cheese should be a skunk pheno, though a masterxcheese will definetly produce some very interesting plants...However real cheese should be a pretty strong ass kicking strain with more body stone in its effect...