I just came to this forum to actually ask a C1P question. I am moving to C1P from LR (Originally I was from Aperture).
C1P Benefits: best RAW converter. Customizable workspace. Natural to use. Session workflow is very nice. Keyboarding system has been improved
C1P Cons: Keywords don't really kick in for the images until you export the file. That means, other programs won't see them. The Catalog is very prone to crashing once you hit 10K. As a DAM, it is just not up to snuff.
My recommendation: Try it out for a month. Like, REALLY try it out. Map out a workflow and think of every contingency. I tried C18, loved it, couldn't handle the lack of DAM, went to LR. Now I am back to C1, trying to find a way to edit my photos and have a DAM/searchable library or something that will let me batch metadata easily.
My current workflow idea is to edit/cull in C1, Keyword those files in Photosupreme or C1P, export jpegs, and then store the jpegs in Photos. I'm having trouble finding something that can see the edits in C1P, edit their metadata, and allow global search.
Photo Supreme supposedly does, but I haven't gotten it quite down and it doesn't support retina...
I haven't figure out Photomechanic.