Yes! I love it, even knowing that the estimated HbA1c isn’t always completely accurate but is a good guide of trends.
Just turn off the silly monster sounds!
This is one of the few apps that I pay the annual subscription for... couldn't imagine not having it now.
I'd also recommend MyFitnessPal to anyone looking to lose weight. It's helped me reduce my weight from 95kg in January to 81.5kg this morning... just on the free version.
Download it from the playstore and there's a quick tutorial... after that you just enter your info, carbs, insulin, meal and so on. I use it mainly to track what I have done, but it does have a bolus calculator built in.