Nope. We've tried a few in the past and they've just done NOTHING so we're not going back. We have much more success on android and apple even with the increased competition.
Are they quality, well marketed apps? We on WP7 are somewhat app-starved compared to other platforms, most people I know on WP7 download apps left and right as long as they know the app exists. Free versions with ads alongside a premium version without ads seem to do very well, and gain money no matter what.
A big problem I've had is finding an app exists and being surprised that it exists. If it doesn't get advertised, there's no way to know it's there.
A big problem I've had is finding an app exists and being surprised that it exists. If it doesn't get advertised, there's no way to know it's there.