These things are incredible and I can't wait to get in my car and do a long drive because they do such a number on the ride of your vehicle. Changes everything.. I still have all the mobility of my original power seat adjustment but the bottom portion being slanted back gives so much more support. You don't even know until you experience it.
I originally went with seat jackers, my 5' 2" wife loved them, myself at 6' had just a little clearance between my head and the sound bar. I later switched to the 1.5" seat slammers and we are both very pleased with the results.
