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They are claiming to be better, and a lot less $$.
Anyone can claim to have a better product, ask them why before believing. The DUI is custom curved for your engines specs, they ask you everything about your engine, your truck, and intended use before doing a custom advance curve for your application. If these guys will do the same, for a better price then good for us due to competition. If it is just a plain jane universal fit model made by a fly by night company then be leary as you get what you pay for.
I bought one off ebay about a year ago. Not sure what the brand was, but for $100 +/- brand new with a 1 year warranty, I'm sure it was not made in the USA. I installed it in my son's truck (.060 over 351W, gt40p heads, Mac Headers, Comp Cams 272 Cam, crane roller rockers, 725 Road Demon). My Son runs this truck pretty hard in the mud, and we've have had no problems so far. I know reliability was a factor, being this is my son's daily driver, but cost was also a factor. You can buy 3 of these complete distributors for the price of 1 DUI. I firmly believe the DUI is a better unit, but I couldn't afford it.