I have a 138 and it is a great enlarger. I haven;t used it in a bout a year or so because of contact printing. I did need to replace the power switch unit and it ain't easy. Parts are next to impossible (in my experience) and repairs are harder to come by. I finally found a replacement by sheer luck. Durst, of course, has no parts or help to offer. These enlargers have been out of production too long. But when they work, they are the best.