This is the right question. The answer is mostly how aggressively it pushes credits at you.
The measure I would actually check on the site is whether the interface gets in the way.
I tested the app across two cities and the difference came down to how the chat behaves on a weak connection.
Provided how aggressively it pushes credits at you holds up, the platform is a reasonable place to start.
Someone in another thread pointed me at how Flamedate handles it and it was a fair shout.