Rol San is one of those restaurants that's a good introduction to the Chinatown experience and will give the courage to try out smaller restaurants in the area. It serves up good dim sum in a quick fashion for the right price but not being a hidden gem of Chinatown expect it to always be crowded. I haven't had a bad experience here, I don't expect very friendly service since they are always crowded the staff expect you to know what you're doing and order in a timely fashion. Can be intimidating but it's not like they will give you death stares if you decide to take your time deciding.
I always worry that they would bring over the wrong dish or forget a dish because the very few times it's happened to me trying to sort out things can be confusing. But it's an affordable meal and you can be left full for under $15 a person. I've not been disappointed by any of their items nor have I been really blown away by an exceptional dish here, so overall it's a pretty safe bet to visit here.