A brief and simple A6-sized pocket guide that's very easy to read and easy to check by the day / month. Absolutely fine value for the Amazon price. Full price for its detail seems steep as it doesn't really explain the subject in any detail, if at all, in passing.
It does what it says as a reference point, when wine is at it's the ideal (or worst time) to drink, but if I were promoting biodynamics, I would place a lot more detail into the subject in the introduction of the booklet to promote what the pocket guide is actually about (no 'sell it to me' in the subject), rather than just a passing paragraph, rendering it really just a coloured calendar to the unknown and casual browser.
I logically agree with the principles and this calendar ...Sell it to me and turn a root day into a flower day for 2013 for a 4 star or 5 star review. ;)
Please buy this pocket money guide, a good talking point, even if it's just for your coffee table. :)