I've been lurking in the shadows and playing with this for a while now, and I have to say, it's pure fucking win. The idea of a self serve XRumer blast is great in and of itself, but being able to schedule that blast indefinitely, with custom anchors, on a calendar based schedule, is seriously a god send looking to do heavy link building.
This service delivers 15k links a month, 180k links a god damn year. For everyone in niches with actual competition and money involved, you have to get this or else you'll drown. It's not a substitute for other methods, you can't just set it up and sit back and light up a cigar and watch your victory from afar, but this will really help complete your setup when you're pushing your link building efforts hard.
Guerilla knows his shit and wouldn't steer anyone in the wrong direction when it comes to promoting software and tools, so listen to the guy and sign up, it's more than worth it.