I used bidup today on a NER train from BOS-NYP. I lowballed and got it. I have no interest in upgrading on Acela trains -- I'd rather be in the quiet car than in first class -- but will now bidup any time I find myself on a regional. Today's train was booked near capacity in coach, yet the business class car was at less than 50% of capacity and was as quiet as the quiet car (once I told the woman sitting across the aisle from me she had to use her headphones if she was going to watch videos on her phone!).