Other than a technical issue processing orders, which also affected iOS users, the app has worked nigh-on flawlessly for me over the past week or two.
However, two things stop me from giving it a five-star Play Store review: one, the punitive Isa pricing model and, two, the lack of securities on offer.
As others have mentioned, the app is perhaps too basic in its functionality as well. For me, the dream would be some sort of Webull-Freetrade love child!