My perception has always been that there were major differences in the quality of condensor enlargers. I had a besler condensor head and felt that it was worthless. However, the durst heads are highly rated. I currently have a zone vi cold light head and find it to be quite nice. I won't say that it makes my prints sing; however, it's far superior to the condensor head I used to have. If I was to buy a new head I would probably get an Aristo VCL 4500. I'd love to be able to switch grades with the flip of a switch.