I also can vouch for Arnott. I purchased front struts for my 04 4.4i sport and had a rare failure (crimp ring failed) on a new strut, there was a bad batch at Arnott. They resolved it immediately and replaced with a new one, covered shipping and had excellent immediate customer service. That was back in June and here we are almost into October and haven't had a single issue since.

Here's the DIY video I made for the install:

https://www.youtube.com/watch?v=yW2NhlJ1ahM