Perfect for me

Much better than the calendar that came with the iPhone 4. Easy to see a quick overview of the month and switch to week or day view (which can be customized). When either updating my calendar directly with this app or the one that came with the iPhone, it instantly updates the other. This makes it very convenient to sync with my mac book.
There is still a problem with the "list view" showing duplicate entries. I would also like to see it rotate from a vertical view to a horizontal view. The only difference I can see between selecting view 1 and 2 is on "month view" and how the border appears around the individual days.

1TJ1 about HachiCalendar2 Pro