The Walther PPS has three different magazines; 6, 7 and 8 rounders. The 6 round mag is essentially flush with the grip. The longer mags provide a better place for the 4th and 5th fingers, but they reduce the conceal-ability somewhat.
I was wondering if the factory might consider making extended capacity mags? These would sell at a premium. I think for those who carry an extra mag, that carrying an extra 8 rounds would be better than 6, and for those with big hands who carry on the belt, the extra length of the magazine would be insignificant.