The head morphs are perfect and the CUAs do a great job of replicating their hair, but I have two issues.
First, I always prefer if body morphs were separate from the head morphs so it's easier to customize a look (it's hard to make boobs smaller with morphs than it is to make them bigger).
Second, all of them use the same body/head morph. This isn't necessarily a big deal character wise (although I'm sure I'm not the only one that likes athletic rainbow dash or voluptuous fluttershy) but it means you can't use triggers to automatically load appropriate CUAs. Even 6 differently named but functionally identical morphs would be nice so we can use those triggers.
All good points, thanks for the feedback. Honestly, I don't think separate head morphs are really something I'd do but I see the appeal. I hadn't considered the auto-load CUA stuff. I remember fiddling with that but never got it to work personally! This is a rare case of doing a multi-pack style release so it's not something I expect to really come up in the future but will keep it in mind for then.