I have both. They are indeed a lot of reading, but hell, it's golf, so who cares, right?
IMO, his putting bible is definitely worth the read, although I will warn you that his insistance that we under-read break killed quite a few rounds for me last year, as I missed everything in the world on the high side--by miles! Other than that, tho, he has done some solid work here, and if you can trudge through it, it is most definitely worth the read. His teacher clips are the bomb for grooving center contact, btw.
His short game bible is OK too, but had less real "stuff" for me than the putting bible. He advocates a different short game/wedge swing than full swing, a so-called "dead-hands" swing (the putting stroke is also different, btw). This is fine, unless you're working on your full swing at the same time. If so, it can get a little screwy. As Bama noted, tho, practice is the key here (and with putting, too), and he wants you to quantitate a 1/4, 1/2, and 3/4 swing with each of 4 wedges. This is fine, except that these yardages will alter as you practice more and more, and get increasingly fluid with your swing. In addition, although the system starts very quantitiatively, it ultimately becomes a "feel" approach, because if you practice to the level he suggests you must, you will become so comfortable with each of these 12 swings that you should be able to tell yardages as soon as they leave the clubhead.
And this is where the irony lies, because if you practice with your existing wedges and your current swing as much as he says, the same thing will happen: you'll stand in the fairway, X yards from the target, and just know what club and swing to use, 'cause you've done it 1000 times. Better yet, you hit your prior shot to your preferred wedge distance, and go on autopilot from there.
In short, I took info out of both, but found his putting bible of more use to me. I average about 32 putts per round, now, and he was instrumental in getting me there. My short game is a work in progress, but have ultimately used much less of his philosophy here.