The First lounge in SEA is relatively small. On a busy flight it feels a little crowded when it gets closer to departure. Sometimes people will just briefly look into the lounge and decide that it's better to try the larger Terraces Lounge which is just one room away.

Due to the local law there's no self service of alcoholic beverages in the lounge. You need to ask for a drink. Especially early on (more than two hours before departure) when the lounge is almost empty, you might have to walk to the front desk to place your order. Drinks are all free, unlike in some other US lounges.