I've been on Vocal since last May. I have just under 16, 000 reads when I last checked, about a half dozen top stories, several bonuses but IT's ALL due to heavy self promo and engagement on Vocal FB groups. Vocal, has however, turned into a social blog, IMO. Loads of daily diaries, heavy on poetry and loads of click bait crap. Medium by far out produces Vocal. I only stay because I have good readership in select niches and getting paid from external reads..well, it pays. Plus the challenges. It's not awful but it's not great. I definitely put 80% of my time into Medium first then copy stories over to Vocal.