My not so biased two cents... 
If you always air down to the same pressure, the pre-set options (Staun, etc) make sense. But if your like me, you might air down to 8 psi today, and 20 psi tomorrow, depending on terrain, etc. Add that to the fact I might be in my Tacoma or my Cruiser... and having something easy to move vehicle to vehicle is a no brainer IMHO.
If you always air down to the same pressure, the pre-set options (Staun, etc) make sense. But if your like me, you might air down to 8 psi today, and 20 psi tomorrow, depending on terrain, etc. Add that to the fact I might be in my Tacoma or my Cruiser... and having something easy to move vehicle to vehicle is a no brainer IMHO.