Hey Brian,
I installed my kit over the weekend and yes, I used the stock front springs. If you're doing the install yourself, I would suggest using impact wrenches as it speeds the process up quite a bit, also consider getting some Deep Creep or PB Blaster to help the stubborn nuts and bolts loosen easier.
The rears are a snap, I placed the jack on the rear diff. and use jack stands on the frame for safety. I didn't have to take the brake line brakcet off as stated on the Arnott website tutorial but, that may apply in your case. The abs sensors needed to be removed from the mounting location on the wheel well in order to drop the axle enough to remove the spring. Just keep an eye on everything that's moving as you drop the rear to get the spring out and you'll see what you need to remove for more travel.
I replaced a lot up front along with the struts so I had plenty of room to get them out and back in. I would suggest removing the upper control arm from the knuckle and loosening the two bolts up top so you can swing it up for more room to drop the strut. If you happen to break one of the bolts for the upper control arm, NAPA carries an "Alignment Hardware Kit" for 40 bucks which includes new hardware for one side. No one else had the hardware. So, that may save you some time searching if you happen to snap one like I did. Wiring the module isn't bad either, about 5-10 mins and it was done. Make sure to disconnect the battery and pop out the 30 amp fuse before you install the Arnott Module.
As for the ride quality, it's definitely different than the AutoRide. I like it FAR better now than I did. Very nice ride and you "feel" the car better than with the OEM suspension. Very little body roll and still has nice ride quality. I'm very happy with the kit.
