That's currently where I'm at myself. Do you feel that, that approach scales fine and you get a broad enough idea of where problems are for the general user and where you need to improve/change things?
It doesn't scale, in that you ideally want to test your app's UI/UX with first time users who haven't gotten used to your app's quirks yet. But it allows to catch a lot of stuff early on at the cost of buying them a coffee or a beer (if that).
