I love the Revenant set, but the fact that the notes are incorporated into the large "album" makes them a bit unwieldy to read for long periods of time (which you'll want to do, since they're around 150 pages). Also the small size of the text, as well as the weird, metallic, pastel fonts and background colors can be hard on the eyes. All in all, it's big on flash but somewhat lacking in practicality, which I guess is to be expected considering it was Fahey's last great labor of love.
But yes, it's everything it's cracked up to be. Worth every penny.
As for Revenant itself, I'm pretty sure they're defunct. Their website now lists everything as "out of print" except for the (supposedly) joint release of Paramount's catalog with Third Man records. Now THOSE are some impressive looking sets, at $500 a piece! Not sure how I feel about the digital format on the USB keys in lieu of CDs though. Not surprisingly, JSP has large chunks of Paramount's catalog available for dirt cheap.