I have tried Omnifocus, 2-do and things. All are very nicely developed and simple to use. I personally like the "look" of 2-do because its very colorful and I like to be able to correlate my to-dos list with colors. However, I do like Things a lot because its not too complicated and simple to use, and doesnt keep asking for GPS, which saves battery on my phone. Only advice is maybe add some more colors and make it a little bit eye catching!
cksdmd9 about Things, v2.8.5