DeepOnion and after codebase DeepSend is coming it will become one of the best coin privacy coins and which is good for Onion it has the feature like DeepVault so its not about privacy only but real world product too.
Usage of DeepVault is merely happening, right? There are more projects aiming into the same idea. So, I don't think much good is there.
Regarding privacy, it has stealth address enabled. Nothing much is there. DeepSend is postponed times and times. I don't like this.