I've stayed in them all, and been disappointed at almost every turn. From the nasty, outdated Airport Marriott to the nasty Fair Oaks area Marriott properties, it seemed Marriott was unable to have an above decent hotel in the Dulles area. There are a couple okay SHS near the airport, but nothing really outstanding. The Marriott Suites Herndon is actually very nice, but also quite pricey.
Thankfully, I now know about this hotel. It's a latest-generation SHS. Everything is very clean. There is more seating space for breakfast than at most SHS, so it didn't feel crowded. The breakfast clerk kept everything stocked and clean.
Everything in the room worked as it should. The bed was comfortable, the linen was clean and in good condition and the furniture was in good shape. The staff was attentive without being intrusive.
All in all, this is a SHS that meets every SHS standard. You won't be disappointed staying here.