Echostage was and is the only Megaclub in DC area ...

Echostage was and is the only Megaclub in DC area since Buzz closed down. With that you expect to see world class DJ's and spectacular ever-evolving light show. That is Saturdays. The rest of the so called "shows" that take place on some other nights is not what this place is all about and only there to bring some more revenues for the place.

Sound system is good, but only at it's sweet spot which is in the middle toward the back of the room. The rest is not calibrated to feel the base. So if you into holding the DJ booth's metal railing, you will not hear base that well or feel music. If you don't know what I just said, don't worry about it as your ears would not know the difference.
Drinks are insanely expensive. In May of 2019 vodka shots were $14 and red bull vodka $24.
Crowd is polite as very common for EDM, trance and house shows. If you going for some other show there ignore my last statement.
Place has lost it's popularity among 25-40 year old crowd, but unfortunately they are what brings money to the club. So you get younger crowd which pregames and drinks water. Again music dictates the crowd and so you may find different age group if music is more along house or trance vs anything goes EDM style. But if some basketball player, former model or actor from comedy show in NJ decides that they are also DJ's now, then expect similar level aficionados of music to be present.