Never full, fairly well lit. Nice to have free overnight parking available.
Besides seeing broken glass in the lot, like someone's car got broken into. It was very convenient for me to do what I had to do.
Perfect location (95 & 495) to meet up with a co-worker for carpooling. Some comments indicate that parking should be expanded. I met up here at 5:30 for a 6 am start time for work in Tysons, and there was plenty of available parking at the time. After 7 am, I suppose the lots could fill, but I have not been in that situation. I do feel however that this location has probably not reached its full potential; a DC metro spur to this park-and-ride would be a great idea and would justify a big parking expansion (You could even get to tyson's by rail that way and avoid the beltway traffic at peak hours!
Easy to access. They should expand this lot.
Secure, police are always patrolling the area, safe to park your car. Convenient for carpooling and returning to I-95 N, I-495 W, and I-495/I-95 South.