I have not used the Bentmetal but I have used the ColdSteel ones several times and am happy with the quality. The ColdSteels have all the stampings in them. all you need to finish them is a Dremel tool, some files, a drill motor or drill press and drills/reams. Much cheeper than a bending jig and press, But each-to-his-own.
Remember you do have to weld in the lower rails and harden them also.