I think Melodyne is under rated as a complimentary DAW. I use it not just for timing, tuning and various specialties needed for working on tracks, but I have used it as my first place I do my tracking and make my project foundations. It can be used as a sound design tool as well and harnesses all of Logics EFX through the mixer plug ins. I will say Melodyne has a nice track color and display but over all, the GUI is totally bare bones and colorless. The mixer is almost to colorless for my taste, but less code, less drag on the CPU. This is one of the most comprehensive software products as DAW plug-ins and in my case, I have Melodyne Studio so I can do those things. The editor comes with it so your able to do both instantiate the editor in logic or use Rewire to get the Studio arrange page up and benefit form the super cool platform they have for handing audio much more like midi.
Whenever I beat map, I do it in Melodyne. It's ability to manipulate time and pitch are what make it so valuable. I also find it is good for most any genre of music so a good choice to add on a multiple of levels.