ACT Theater has a great facility. There are several stages, and in each of them there's not a bad seat in the house. The chairs are comfortable and clean, there are refreshments available, including drinks, and the all around atmosphere is great.
The performances are wonderful, too. They put on a wide variety of plays throughout the year, and the caliber of acting is high. I have enjoyed every single performance I've been to.
If you subscribe to the entire season, you also get parking vouchers for a small additional fee. This allows you to park inside the Washington Convention Center and take an indoor route into the theater. This is very convenient, especially if you're running late or it's raining outside.
The season subscription is a little more pricey than some of the other theaters, but considering the amenities and quality, it's more than worth it.