Summary: I work in a hospital laboratory. We have 2 Lexmark 650's for printing results from the instrumentation. On average we have had to replace 1 a year. Either the print quality goes south or the printer starts wrinkling and folding the printouts. On talking with the instrument manufacturers it seems that this is a common problem with this particular model. If you print high volumes stay away from this printer. It's too expensive for the ammount of time it will be usable.
Summary: I have been a long time buyer of Lexmark laser printers. They have always been the best for printing signs on card stock and vinyl labels, and still are. The T650N however, is not as reliable as previous models. Previous models would run for many months or even years without a breakdown, even with heavy use. But I've had numerous T650N printers that have had to be sent for repairs within only a few weeks.