I started using it this year, but found I couldn't make best opportunity for sowing/planting at moonrise/moonset (which I think they said was the better times to do it), and then harvest on the corresponding day. Then, if the weather wasn't playing ball, you lose a week before you can plant/sow/harvest (according to the calendar) - and not harvesting, say, runner beans means that you could be decreasing future crops because the beans have matured. Then, what if you are going to use the same plant, eg, coriander for leaf and then seed, or the strange veg such as kohl rabi - is it a root or a leaf plant.
The waning/waxing and moonrise/moonset arguments seem reasonable. There were days were I wasn't "allowed" to sow/plant the things I wanted to plant out, and then the seedlings get nibbled in the pots in the garden (seem to be less slug damage in the allotment). Though when I was trying to follow the calendar, I wasn't overdoing it. If you can let the moon and zodiac rule your life, and able to sow things at 3am on this day (otherwise have to wait a week) then fine, but I can't go to the allotment in the dark to sow a row of carrots.
