rather pleasant..
I went to the Arlington, VA office last Friday, and it was pretty straight-forward. The biggest annoyance was the people in the queue that wait to get to the information counter and then start looking for documents etc.
The guy at the information counter was very pleased that we had our documents in order and he did not have to ask for anything at all.
Next, the person stamping was very nice also. Even though we had different tokens, she was nice enough to process both our cases at the same time.
The longest wait was just to get a token number. from then on , it took a total of 40 minutes (actual stamping - 10mins for both of us).
SUmmarily - have your documents ready, and be prepared for a pleasant experience (presuming the waiting in line doesnt get to you..)