FreeMyApps doesn't offer a constant flow of apps to install and try. In fact, sometimes you might go days without trying any, so it takes some time before you can earn enough credit to get a reward.
FreeMyApps could be interesting if you have a lot of free time and little income. However, if you're hoping to make a lot of money, this isn't how you're going to do it. If you enjoy trying out new apps and want to be rewarded for it, then this app is for you.