The developer is clearly not an experienced Macintosh developer. I'd guess that his background is in Unix development. As far as I can tell TM works, but the interface needs more and less work. More because much of the application does not have a polished interface that conforms to Apple's human interface guidelines. Less because the preferences window leaves me with the distinct feeling that the author thinks users will want to tweak every possible nuance in the application.

There are nine categories of preferences, for goodness sakes, in an application the just displays temperatures, and each category provides numerous preferences, for a total of over 50 preferences (more than that if you count each preference for each sensor separately). A well-designed Mac application shouldn't burden the user with the responsibility of designing the interface.