Yes, I use COZY :)))
Historically happened this way, that some tenants use ClearNow to pay the rent, sometimes even PayPal :))) somebody uses their own apps to make payments. I like Cozy because it is easier to sign up, free and tenants could use Credit Cards if they want. I tried to use Buildium but found it is not friendly at set up stage, so I quit.
For listing I use only Zillow, no signs or Craigs List - a smaller volume of better quality prospects. I plan to try Cosy for listing as well, hope it will send it directly to Zillow :)))
I use Quickbooks for tracking cash flow
Zillow is implementing tenants screening and payments, so they will dominate the market soon after they will add main features.
For managing different legal entities and different accounts I found that www.rentmanager.com will work the best and has very reasonable price and almost unlimited functionality.
Regarding Cozy, it will be great if it will be able to manage different entities from one account, so I will be able to send rent from different properties to different accounts.
Cozy definitely has potential, it feels user-friendly. If you guys will be on the top of the main functionality for small landlords (up to 30 units or so), you will win the game in this segment.