actually, they are manually adjusting, you adjust them yourself, vs that plastic self adjuster under the dash
-it is a pain in the ass to jack up the car and pull the cover off, crawl under on your back and adjust, much easier to get a firewall adjuster
-most importantly, ALL of the adjustable cables are complete garbage. They are all pretty much made by one company somewhere before they get filtered down and distributed to all of the different vendors to lable them as their own.
The build quality on the adjustable cables is really, really bad and almost always within x amount of time (usually sooner rather than later) they will stretch and snap, leaving you stranded. The only alternative is to use an oem non adjustable cable and a good firewall adjuster. ALthough the oem cables are now made in taiwan, they still, by far have the best build quality.
http://maximummotorsports.com/cq.asp#cables
That is maximum motorsports take on the adjustable cables. They say the exact same thing I just said, and show pictures of the cables for comparison sakes. Also, do a search here, and at
www.corral.net for "adjustable cables" and you'll pull up hundreds of threads with people testifying how crappy theirs was.
just trying to save you future headache.