We are staying at the Anaheim Marriott for 4 nights in July during Dh's convention (and my DL time

). His work won't pay for Concierge but I was thinking about upgrading at check - in. Does anyone know if they would let me upgrade and pay with a different card and/or if they have gotten the value out of it? What are the advantages... is it just food in the lounge and how far would that be from our room? TIA.
I don't know if they will allow you to pay for an upgrade at check in time using your credit card. I know, from my research, that concierge access consistently costs $50/day. If you are the only person making use of the lounge, then I'm not sure if a daily fee of $50 would be worth it.
We've stayed at the Marriott in a concierge room three times. The first time, the concierge lounge was being renovated, so breakfast and dinner were served in a main floor conference room. Very inconvenient, and there were no snacks offered during the day.
The second time, we received a free upgrade to park view (which is essentially a view of the Hilton across the street, so not much of a big deal). But, our room was directly across from the concierge lounge, so it was literally 6 feet from our room to the lounge. Wifi isn't free except in the lounge, so one unexpected benefit which made my teenage daughters very happy is that we could access the lounge wifi from our room.
The third time we were on a floor either above or below the floor the lounge is on, so going to the lounge involved a walk down the hall to the elevator, a one floor elevator trip, then a very short walk to the lounge which is essentially adjacent to the elevators.
In terms of food, the breakfast was excellent for people who like scrambled eggs, sausage or bacon, and potatoes. A couple of times they offered excellent fruit crepes of some sort (blueberry, I think). Also the usual other items such as bulk oatmeal, cold cereal, juice, coffee, pastries, toast, and jam.
Snacks during the day were bulk goldfish and a couple of varieties of trail mix. They also had giant jars of four or five types of candy (individually wrapped chocolates and rockets are the two types I can remember). Also cans and bottles of juice and soft drinks suitable for taking to the parks.
The main evening course during our last two day stay was a type of coconut shrimp with rice one day and spaghetti with meat sauce/balls the second day. On previous trips we've also had salmon and a chicken stir fry. They also always have cheese and crackers, vegie trays, probably a few more items I can't remember.
For two or three hours ending, I believe, at 10pm, they brought out both simple (e.g., large chocolate chip cookies) and more elaborate (e.g., little cheesecakes) desserts. Every fifteen or twenty minutes they'd bring out something new, so maybe they offered eight different desserts over the two hours. My daughters liked the fancy desserts, so we'd head to the lounge every half hour or so to sample the latest desserts.
In terms of other benefits, nothing significant springs to mind. They had free newspapers (USA Today and Wall Street Journal) in the lounge, but I think those are available to all hotel guests. There are four computer terminals in the lounge for accessing the internet, plus free wifi. Excellent coffee available all day, but the blend is a bit strong for my taste. Also a wide variety of tea bags. Alcoholic drinks are available for purchase, but to save money I always just buy a case of beer somewhere and keep beer in the room fridge.
Like I mentioned in my previous post, at $50 the lounge is definitely an excellent deal for a family of four. For one person, hard to say.