Sure, he doesn't charge you for the first 30 days on the expensive products, and he doesn't charge you for 7 days on the cheaper products.
I'm assuming you've already been versed in his 'foundational e-books' so you are buying the DVD sets on his other courses.
If I were you - I'd buy everything he has out - try it for 30 days, and if it works for you and you start seeing changes within 30 days, then great, otherwise, just return the products. The reason being, if you go for a refund on one product, they may not do business with you again - so you may as well buy everything out then go for a refund if it doesn't work, that way you already got everything from them for free if it doesn't work, and if it makes your life better, then what's $ 500 if you are getting laid or whatever you want?