I didn't realize that the Pearson testing center would appear on Yelp, but since it's here I'll put…read morein a review.
First, if you want a good idea of what your testing experience will be like, check out this video:
https://youtu.be/1kK-QuuZeuw
While this video wasn't taken at the DC center, it is very much the same layout, decor, computers, etc.
The testing center is what you can expect it to be, a quiet and somewhat secluded space with a few workstations where you take your test. Security is tight, you will have to check-in at the lobby security guard, who will then direct you to the elevator that takes you to the Pearson suite. Once in the testing center, you will have your picture taken and your palm vein scanned. The palm vein gets scanned every time you enter and exit the testing room, including breaks.
Be advised that if you do need to use the restroom during a break: the restrooms are located outside the testing center in the hallway. You will need to borrow a key from the front-desk in order to use it. While the restrooms are a short distance away, keep in mind that you do lose about a minute of your break just having to walk to and from the restroom.
There are two employees at the test center, one at the front desk to check you in and one who is the "proctor": s/he is stationed outside the testing room and can monitor each test taker through a large glass window and video cameras. When I took my test the first time, I would agree with the other reviews that both test employees were very strict and followed the rules to the dotted i. They weren't nice and didn't smile at all. I felt that one step out of line would have had me kicked out of my test. But on my second visit, I encountered two different employees who were the opposite: they were both laid back and very friendly. They were still professional and certainly harped on the rules, but they didn't do it in a condescending sort of way. It was as if they understood that you were stressed out about your test, and they wanted to make you feel comfortable. So overall, I would say that your testing experience might vary based on the testing center employees you get and how their attitudes are.
Pearson's primary competitor in computerized-testing is Prometric. I took a different test before at a Prometric center (not in the DC area though) and I can say that Pearson is a lot better. At the Prometric center, I had to wait 45 minutes(!) from my scheduled appointment time before I was even seated at a computer to begin my test. The Prometric center was setup completedly different from Pearson, with the center stuffed with I'd estimate 30-40 test takers sitting in a large cube farm (the Pearson center seats about 12 max, I recall). The Prometric center was definitely not run very well, which certainly added to my testing anxiety. I can therefore give Pearson credit for at least managing their test center much more professionally and sanely.
At the end, I would give the Pearson testing center 4 stars. One star off simply for the restroom situation, and maybe for the inconsistency of the staff's attitudes. But, compared to the Prometric testing center I think Pearson is very good at keeping everything organized and professional. Just one less thing to worry about on test day.