You might also check these threads ...
http://forums.omnigroup.com/showthread.php?t=20623
http://forums.omnigroup.com/showthread.php?t=15989
http://forums.omnigroup.com/showthread.php?t=20929
http://forums.omnigroup.com/showthread.php?t=20583
http://forums.omnigroup.com/showthread.php?t=20747
https://culturedcode.com/forums/read.php?7,47647
https://culturedcode.com/forums/read.php?9,50297,page=2
https://culturedcode.com/forums/read.php?7,49454
I started looking at both Things and OF for Mac and iPod. My initial thought was, OF was too complicated and too involved in itself with the process of managing tasks (ie, it would be a distraction that would limit me from actually doing tasks). I eventually found that Things was too limited for my needs in managing the host of tasks that I was needing to do, to the point where I was stalling out on doing them (ie, I was spending more time trying to keep a larger picture on my tasks, and that limited me from actually doing tasks).
The real breakpoint for me was when I discovered that I could almost use OF/iPod as a true stand-alone app, whereas Things/iPod was crippled compared with its Mac offering. This distinction has only gotten even more true over the last six months.
HTH
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JJW