Well hey, it works. And I do like the fact that I can sync many calendars simultaneously and with Google in more than one way. My wife and I share our calendars it has been a big improvement in our ability to keep keep schedules straight. Such a simple thing goes such a long way to harmony. :0
I find the built in calendar navigation to be confusing. Apple does a swipe right/left in so many apps yet the calendar you can not swipe right/left to get to the next day in day view. You have to tap the arrows. It's so inconsistent with the iPhone app navigation. And the month view is nearly useless because you can only see two events per day until you scroll. Why show such big squares with nothing in them but a dot?
Anyway, it works, I admit that. I'm not complaining. I never thought of trying Agendus or PI but now I might.