I changed to out my springs last week to the Arnott versions.

It was a very easy job that I got done in an hour or so. It was actually much easier than changing a coil spring (no spring compressor required, no bolts).

I did pull the panel off from the passenger side and loosen the lines to deflate the bags. I changed them out and then put only part of the weight of the X5 on the tires while they aired up the first time to avoid any possibility of them folding up funny when deflated.

The replacment springs seem fine so far. They "are not" OEM but they are much cheaper at around $140 each.

-Rich