Namely, the program's playing strength depends on the power of the machine on which it is installed. On a modern PC (powerful) it easily passes the elo 3000 points, otherwise do not count on less than 2400 elo point for a small machine. Plenty to give (a lot) of trouble with VERY good amateurs and beyond. For information, champions human world flirt with 2900 points.
Note that the program is still consumer oriented, for whom the features are more than ample. For despite his playing strength, it is rather didactic in nature.
To summarize, if you are lovers of chess, from beginner to very good amateur, and you're looking for a program that is both solid, didactic, relatively complete, visually pleasing, and very easy to access, you do absolutely no reason to look any further.
For me he is one of resident programs on my machine, and it works without any problems on Win7 64.