The Retro 800 is essentially the Trace idea, (12 band eq) built into a modern micro amp form. It works fine, and you can get anything you want from the eq...but not really the "signature" response that a lot of makers build into their preamp designs. I've also still got a TE MkIV GP11 preamp, and that too essentially has no sound of its own, as long as you ignore the pre-shape "slap switch". Its just eq, and you use it as you want.
Nothing outdated about it, except the bulk 19" rack format and a bit of circuit hiss...but its also got a very effective noise gate built in, and a proper transformer DI. Its a very well designed professional unit.
Now, what people did with them, thats another thing entirely....