E101  This is really one of the most irritating mac apps of these days, they even won an Apple GUI Design price which only proves how superficial Apple got on the design of the user interface. Eye candy doesn't make your computer usable. Things lacks so manying small improvements and has so many shortsighted shortcomings, it's a daily annoyance. Just now I couldn't find a keyboard shortcut to move an item from the inbox directly to the "Someday" folder.

The GUI of Things is like Apple implemented the Cut and Copy functionality back in the early 80ies, but forgot to add the Paste.

I'm using Things because of the lack of a better alternative (The Hit List was *very* promising but the developer decided to waste time on the iPhone companion, too).  
(Version 1.2.3)

E101  While Billings matured to a somehow usable application over the years, the lack of support in the sense of integrating requested (in my eyes necessary) features is not at all satisfying.

Further problems:

- Billings is not really usable on several synced machines, links to address book entries break

- It's not possible to switch currencies

- The report engine is very flexible, but full of bugs and quirks

- The UI design is not finished

- The internationalization is pathetic  
(Version 3.0.5)