When the Messenger had a leaking airbag/ sagging rear it was a super cheap option - remove airbags and supercharger, switch to springs, seems great. Compressing the springs for installation was a bit tricky though - have a good spring compression tool handy - and make sure it fits OUTSIDE of the spring or you won't be able to remove it. Driving seems normal. Outperforms any airbag replacement, equalizer valve and compressor or any of the above.