De-Vere Dichromats tend to fade dichroic filters fairly quickly, especially the megenta ones. They do so because the filter is between the lamps and the heat absorbing glass. Why they did it this way, I'll never know. When I first got my enlarger, I couldn't get above grade 3.5 contrast. After I bought new filters, I got to grade 4.5.

I'm not sure what HolgaPHile means by adjustability. You can align the lens stage and negative stage easily, and all of the parts are meant for easy adjustment/replacement in a working commercial setting.