You get good apps. You also get good way to get reviews with exchange. But it will take much longer time to get enough review.
Therefore, buying Google Play installs for app on BestReviewApp is good experience. It will guide real users to install even review the app. Publishers can choose CPI directly or installs&reviews with targeted countries. This method will help a lot on app overall ranking.
Also, if you have no enough budget, you may post app on some review websites, then you can leave reviews and ask others to leave as well. But this way only can make app popular in website. Reviews will not show in App Store below your app. And exchange app reviews with other publishers, you can find these groups in this forum or some Facebook groups.