on 17 January 2010
These planispheres (I have the 51N and 42N) are "lp" sized and appear to be good quality. They are made of plastic, so won't get soggy if left out in the dew. The colours are such that they can be read in the red light of astronomical torches. Being about 30cm across, they are large enough to have the constellation names and major stars listed without getting too "busy". The milky way and the position of the Messier objects are shown, too.
The instructions seem clear and will allow beginners to start using them easily. The inside cover has some guides of what to look at in the different seasons. They also come with tables of the 4 main planets to the end of 2014, (since these cannot be plotted directly on the chart) which aren't difficult to use. There is no mention, either in the guides, or on the chart of the moon's position or it's phases.