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It's pricey but it's also open source. The recipe is on their website along with hundred of community submitted variants. It even has tools for making your own variant to suit your needs. By purchasing the ingredients and mixing it yourself, you can get the per unit cost down pretty low and modify the taste to your preferences.
The big downside I see is that the claims of being nutritionally complete are based on crushing up a multivitamin into the mix. Without the multivitamin, your micronutrients are not well provided for. If you believe multivitamins are a good way of getting micronutrients, then go for it. I'm just a bit skeptical of it being truly nutritionally complete. Reminds me of the claims of sugar encrusted kiddie cereals claiming to be highly nutritious because they've been sprayed with a vitamin fortified slurry.
