I've used the Crown kit and it's very high quality. All the pictures I've seen for it listed don't show the very beefy galvy brackets they inlcuded, too. Also, they don't make the shock, they just distribute it...and there are actually very few companies actually producing shocks. Wouldn't surprise me if it's the same one used in the kit you're buying.
Related topic, I saw "How It's Made" sometime last year and they showed all these name brand shocks being produced in the same factory, by the same machines, and after, they simply painted them different colors, applied the decals, and sent them out.