The Summa Theologica is too hefty to carry around, but this Kindle version makes it possible. It is a good translation, with a well thought out transition to the Kindle format, with a useful article-by-article contents section, allowing you to go straight to the section you want. The text is also clear, crisp and easy to read.
There is nothing to really complain about with this Kindle book, except that the text itself is a difficult read with many philosophical concepts which are simply assumed.
Recommended to all those studying Medieval Philosophy and Theology, and those who wish to really get to grips with the thought of Thomas Aquinas. It is a work of sheer genius and a classic of western Christian thought which has stood the test of time.