I have a 400P that has been in hard use for over 5, probably closer to 8, years; great product. Obviously not a permanent mount like the ARB but I've been super pleased with it.Mine is 10 years old and going strong yet
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Didn't have the fancy case back then and I use an old army tool bag for storage plus hoses, etc. Works surprisingly well but not the fastest and is a bit of a PITA to hook up. I used to use a shop across from the office for some maintenance and one day when I walked in they had a pair of Viair chrome compressors sitting on top of some boxes. I asked him about them and he does a lot of custom builds for car shows. And wins a lot he travels all over the Country and has a row of trophies on one wall. All he uses is the chrome Viair compressors he mounts them permanently in the show cars and said that he didn't think you can kill them, he has never had one die. That he knows of. a lot of his work is for customers custom cars that get shown.
Have looked at upgrading to the larger 400P or 450P with a connection to the 7 pin trailer connection for power. Maybe someday.
I standardized on Rigid battery tools and picked up an inflator a few years ago for something like $50 and it works shockingly well. I already carry battery operated impact wrench and thanks to @Rednexus now my Sawzall. And the inflator plus 2 batteries. It is just as fast as the Viair and easier to use. Inflating all 4 tires uses less than half the battery can get 3 inflations per battery. But spending 3+ weeks at a pop at either Canada or Arrowhead means I also have to take and use the charger every couple of days. Have to charge the dogs collars and Garmin Alpha so it gets a bit ridiculous with all the cables and electronics in the cabin at night.
Now that I write this and think about it I really should start down that upgrading path.