I spent $50k on my tractor. I think it's worthwhile spending $500 on Rim Guard. I believe in spending good money on high performance, quality products. Your philosophy may differ. Also, the balloon juice we breathe is 78% nitrogen so to pay extra for pure nitrogen in your tires is pointless.I am sure RimGuard works well, but windshield washer fluid is inexpensive, and you can do it yourself.
Nitrogen works well in car tires too, but also at what price?