I have one DZ1000 on an Atlas-O switch and it works great. I had one spot where the Atlas switch machine would not fit so I replaced it with a DZ1000. These are very nice switch machines. I think you will be pleased with them. I am not using the non-derail features.
The rest of my switches still have the Atlas switch machines, but if any go bad I might just use the DZ1000s to replace them. I have not had any problems with my Atlas switch machines like the ones many others have reported, so I might as well keep using them until they fail. I am not using the non-derail features on these either.