In many ways this is a great map. It is lightweight, fits in a coat pocket when folded, unfolds and folds back together very easily. The street map is a good size and names are very clear. It makes good use of colour and symbols to highlight landmarks and useful buildings (including hotels, which is very useful).
It covers almost the entire area within the circle line on the metro. On the reverse it has an index of streets, hotels, places of interest, embassies. Plus 2 smaller maps of the wider Moscow area.
Its downfall is the metro information. On the rear of the outer cover it has a metro map on which I have found (to my cost) a number of errors - stations wrongly named, or shown but not named, and in at least 1 case just not shown at all! (Mayakovskaya, which is not a new station, so there's no excuse). The streetmap has the metro lines and stations marked, mostly but not always in the correct place.
Bottom line? it's weather proof, which is very useful - worth buying for this alone probably. For most things it is accurate and reliable. Just make sure you carry an alternative metro map.