This magazine has the virtue of allowing a slim grip on the P225. The grip on the P225 is in my view superb, because it is big enough that a large-handed person can use it but slim enough that a small-handed person can use it too.
The P225 has not been made in many variations over the years, primarily because the main buyers have been the police. Target shooters rarely show any interest in the P225, although in countries where it is legal to do so, it has sold to people who are interested in carrying a gun for self-defence. The main variants of the P225 are the one shown here, and the much rarer version with the heel-of-the-butt magazine release. It has also been made with various sight and finish options. The most common finish encountered is the one shown here, but it has also been made with nickel and K-Kote finishes. A version with a different hammer was also made for the German police. The hammer has a cutout under the spur so that if the gun is dropped repeatedly on the hammer, the spur will bend and the mechanism can be checked to see if it has broken. I'm not quite sure what this says about German police training!
http://www.cybershooters.org/dgca/sig-sauer_p225.htm