Mag, get it directly from DSC if you got the extra cash. The DS unit is not programmable is its difference, and a few have “bricked” themselves in my case just because I used a trickle charger over a winter.
On the other hand, I really like the unit and would not ever be without it. The ride is better, and it does have a noticeable effect on handling and a couple of other items you would probably only notice on a course.