I bought a guide recently, it was good - I have yet to test out the method, but I felt like I got my money's worth from my purchase. I would say to do your due diligence, check out reviews, and then make a purchase decision based on that. As with anything, if you're thinking of spending your last $100 on information - don't. The internet is full of free resources to get started. However, if you can afford to drop $100 to learn something new and unsaturated, and you've done your due diligence, go for it.