Magne-Shades: we love ours. They are easy on and off. We ordered direct from the Magne-Shade company and bought their storage bag so they go in the bag then in a bin. Con- we had small scratches on the driver door where the magnets touch. It was right after we camped in iron country. I suspect John dropped that shade and some of those little rocks stuck in it so when he adjusted the shade, he scratched the rig. Doug buffed them out for us and we've checked nothing is stuck in the shades. (I'm not picking on John, I dropped a magnet for our tow lights and was surprised to see how much grit was magnetically attached).
We have Weather Tech floor mats and front rain guards on our Subaru and they are great. It was a struggle getting the rain guards on but the front guards did fit. The con on those is the automatic window sometimes senses them in the track and won't close. It can take three or four frustrating tries. The rear guards did not fit and are in our storage. Maybe someday I'll whittle them down and get them on there.
We bought the two floor mats for the E450 hoping there wasn't enough change over the years. The driver side mat is fine but the passenger one moves, probably because it is such a weird shape. We didn't buy the one piece mat because we thought it might trip us. These mats trap a lot of dirt and we just dump it out the door. Very nice to have.
We don't have rain guards for the rig so we don't know if they'd fit. If we had them on, the magne-shades wouldn't fit.