That system looks pretty interesting - the components look fairly high quality, and I like that they included a compressed air dryer; I wouldn't normally expect to see details like that in an aftermarket automotive system. Like they said, that will prolong the life of the pneumatic components and should make the system more reliable in extreme weather conditions.
The only real red flag I see with it is the ride height change in each different operating mode. Switching from everyday "Touring" mode to the "Track" mode is a 50mm(1.96 inch) drop in ride height - and that sounds fairly extreme to me for an on-the-fly change. The alignment settings of all 4 wheels will change quite a bit going through that range of motion, possibly more than could be effectively compensated for by running a very conservative street/Touring alignment (alignment settings will often change to the agressive side as a cars ride height drops, like gaining a lot of static negative camber and toe-out). This would be vehicle-specific though, and depend on the suspension geometry of the particular car it was put on.
I would actually be more concerned about the change in suspension geometry itself that can occur from lowering a car 2" from its factory height. Intuitively you'd think lowering the car would make it faster due to the resultant lower Center of Gravity, which should decrease load transfer between the inside and outside tires during cornering. Again, you'd have to look at different model cars as individual cases, but in general especially for cars with strut-type suspensions, as you lower the inner pivot points of the control arms (which you're doing by lowering the car) the roll center heights at each end of the car can drop. The roll centers can very easily drop more than the C.G. does, and you could actually end up with an larger roll moment than you started with... which then requires stiffer springs and swaybars to cure the increased body roll and you end up with less suspension compliance over bumps and less total grip than you started with. Not to mention it can have a bad effect on the camber curves of the wheels (camber angle vs. vertical suspension travel) and make the car bumpsteer like crazy.
Well, I've been rambling again... so, what's the point of all this? (Sorry, I really didn't mean to lecture...
feel free to smack me around) Just that slamming the car down isn't necessarily going to be a benefit - it can actually has the potential to really muck up the alignment and factory suspension geometry and make the handling worse.