Unpopular opinion: You don't need 5 different plugins to get a vocal to shine.
Rebuttal: Fresh Air is incredible on jazz and classical. If you have a dark string quartet recording, a touch of Fresh Air brings out the rosin on the bows. It works on anything you want to make "feel" closer to the listener.
One of the most significant advantages of Fresh Air at Slate Digital is its nearly nonexistent learning curve. It is often described as "finishing salt" for a track, meant to be applied at the end of a processing chain to lift the audio out of a "dull" state. Key workflow features include:
Applying a small amount (10-20% mix) on the master bus can "glue" a mix together and mimic the frequency response of expensive analog hardware, lifting a veil of "digital mud."