There are few systems I'd consider.. The Invisi-Brake from Roadmaster is on the short list of those. I have not seen one, however I have read the manuals, and I've read the ads, and from what I have read it is a system worthy of consideration..
US-Gear Unified Brake Decelerator, which I did have, is another such system, there are things I like about the US gear system.. However there are tings I like about the Invisi Brake that offset it.
And Ready Brake (A surge bake system) is the 3rd one on my short list.
If I had a DP I'd add Air Force One. and M&G to the list.
Home is where I park it!