Geoff Thorn (guitar player and teacher extraordinaire) showed me a new toy. He described it as the preamp circuit from an echoplex (one of those mythical hardware things I had heard about but never seen or used). He was unable to explain exactly what it did but summarized with a vague, "it just makes everything better." This seems to be a common theme with this device, everybody that I know that has one raves about it (and in most cases, end up never switching it off).
Not wanting to feel left out, I recently got one of my own. It's difficult for a geek like myself to admit but I have no clue what this thing does. But it is good. And since getting it, I have recorded no guitar part without it engaged.