Hi Neil - these are great watches combining the Heuer heritage and Lemania 5100 movement. They measure around 38mm excluding crown and like all Carrera's, they are very comfortable to wear. I have no experience with service costs or replacement crystals but I believe neither should be a problem as there is nothing out of the ordinary here. After time the PVD coating takes on a lovely mat finish but like all early examples of this finish they do tend to chip when handles without due care and attention. So a ding becomes more obvious than on a stainless steel cased watch. I would say prices will start around the £1500 mark of a good example. I sold a NOS piece on bracelet for £2750. The bracelets with correct end pieces are hard to find and the PVD coating on these are less durable than on the watch case. There is of course the sister watch reference 510.523 in brushed stainless which is superb as well. Examples of both below.
Good luck with the search as they are quite scarce.
regards
Paul
www.heuerworld.com