I personally find no advantage to being a premium member. Their monthly newsletter is only 4 or 5 8×11 pages. was’nt worth the money. As far as marks go you can get them on the internet very easily. I reccomend you get the new’s paper called Yesteryear. Kovels has 2 pages of info and questions also what things are selling for from auctions, flea markets etc. Over 100 items. It also includes articles from other experts including furniture and is very thick. What’s hot and what’s not and it’s only $19.00 a year. Another one I like is Antique Trader book that is weekly and cheap. The last two weeks they had articles on bottle collecting, thats what hot right now. I do prefer Kovels price guides except I wish they would expand to more things from the 40 and 50ties on up.