I have purchased 4 or 5 books now from their Keto/Paleo line.
The quality of the books is great. As a long-term keto-follower, I often get in the habit of throwing the same quick meals together. But, sometimes, I start craving non-keto foods. Their recipe books give me that non-keto feeling, without the carbs. They're great recipes and I've tried dozens of them. I do have to be careful about measuring portions because some run close to my fat-carb-protein limits, but I'm already used to tracking everything so it's not a big deal.
As for customer service? The only time I had to reach out to them was when a book arrived damaged. It appeared to have been banged around in shipping though (not at their warehouse). I contacted them and a replacement book was sent.
I'm reading the other reviews & I'm not sure what products they have that enroll you into additional programs where you're charged monthly as I haven't ran across those. The only thing I hate, that I find a little "scammy-looking" is that they like to market their books as being "free" because they "found" additional in the warehouse. You just have to pay a small shipping and handling fee. Buyers aren't stupid and I know they learned this bro-marketing technique from someone and it may actually work. But, I really wish they'd just market it as a good deal. I'd share their links with everyone I know. But, because of that particular marketing technique I feel a little "icky" sharing it with other people. Despite my distaste for the marketing... I still believe the product and my experience with the order/shipping process deserves 5-stars.
That said, I only stumbled across these reviews because I was looking up their site to order another book. It's a great price, for a great product.