Read about the new coins the other day and thought it would be nice to have some on hand. The key, in part to their potential success will be the ability use them in vending machines. If the machines will not accept them without modifications, I doubt the coins will catch on.
Interestingly, the gold Sacagawea coins are popular in Ecuador, where they use US money (at least for now). In the rural areas, many people do not use wallets, but instead crumple up their money in to wad. Almost all of the US paper one-dollar and five dollar bills look quite worn. The dollar coin, partially because of its gold color and durability are favored over the one-dollar bill.
Pete