Yeah, there is a gap in the market in between Google Calendar and Farmer's Wife / Studio Suite.
We have SS, bought it when it was available as perpetual license. Froze the server and client systems to avoid upgrades (customising the software was costly and very time consuming). But seven years on, office computers are stuck on El Capitan OS which is becoming a slight issue.
It's well suited for what we do but I am also looking for something else, something that can integrate with our accounts a bit better.