Well I've taken the plunge anyway and I'm hoping my Inconel AR system will be on by end of the week.
I had the same thoughts about the unfinished look until I saw the single slash cut on a red bike. Now I've seen the carbon belly pan on another bike I reckon it will look awesome. As you said each to his own.
The way I look at it is its better power, torque, less weight and hopefully less heat and I reckon it looks hardcore, plus it sounds amazing.
I like my Termis but they look too big for the bike; hanging below the line of the bodywork, they're heavy, the sound isn't much better than stock and the two-tone look is a bit cheap (even though they are not!)
Even if the AR system didn't work out I wouldn't go back to Termi's unless they came up with a better design. (Apart from chucking them back on for warranty work).