I bought one of these back in January, it was to replace a bike that I had had for years and had just died. I do about 1 hour per day and to start with it was very quiet, however after about 5 weeks it had developed a clunking sound on every pedal turn. I contacted york direct and after a few weeks of poor customer service (I did not get a single one of the many promised callbacks) they agreed to replace the bike. The new bike is much better and apart from a few creaks it is very quiet, however if this one goes the same way then I will be after a refund as I don't think I would have another York.
Review update November 2009, sure enough I am now having problems with the second bike. It has become increasingly noisy over the last couple of weeks. It has developed a scraping noise and the casing creaks and groans. I have emailed York and I will see what they have to say, however if they offer a choice of replacement or refund I will go for a refund as I would not go for another York cycle. I could not recommend the build quality